what is the atomic mass of cesium

The information contained in this website is for general information purposes only. Cesium was the first element to be found with a spectroscope. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. It is the electrons that are responsible for the chemical bavavior of atoms, and which identify the various chemical elements. Cesium is exposed to humans by breathing, drinking, or eating. Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm. For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. Periodic Table. What is the average atomic mass? Periodic Table 3. The nucleus is composed of protons and neutrons. The standard atomic weight for cesium is 133. It has thirty-nine known isotopes, having atomic masses ranging from 112 to 151. It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. Cesium is a salt metal, alongside lithium, sodium, potassium, rubidium, and francium. It is utilized in thermionic generators, which convert heat energy into electrical energy. The density of a material varies with temperature and pressure. Cesium is utilized in producing optical glasses and other optical instruments. As a result of this expansion, the density of most materials decreases. 1) You may use almost everything for non-commercial and educational use. The classical description cannot be used to describe things on the atomic scale. There are 3 other radioactive cesium isotopes that have atomic weights of 134, 135, and 137. Isotopes. Alkali metals are profoundly reactive, have one electron in their outer shell, and don't happen openly in nature. See also: Atomic Mass Number – Does it conserve in a nuclear reaction? Cesium formate-based drilling fluids are extensively used in extractive oil industry. Hassium is a chemical element with symbol Hs and atomic number 108. Image showing periodicity of valence s-orbital radius for the chemical elements as size-coded balls on a periodic table grid. References. This silvery metal with a golden cast is the most reactive and out of all the metals, one of the softest. Molar mass of CsCl = 168.35845 g/mol Convert grams Caesium Chloride to moles or moles Caesium Chloride to grams. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The Commission last revised the standard atomic weight of caesium in 2013 based on the latest Atomic Mass Evaluation by IUPAP. The electron configuration of cesium is [Xe] 6s1. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. As backed up by physical properties, Cesium also depicts various chemical properties. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. But this “huge” space is occupied primarily by electrons, because the nucleus occupies only about 1721×10−45 m3 of space. Answers (1) Sebella 7 August, 05:52. = 55 , ATOMIC MASS = 132.90543(5) , MELTING POINT (C)= 28.40±0.01 , BOILING POINT (C) = 669.3FRANCIUM:- Francium is a chemical elemen… The Van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom. Molecular weight calculation: 132.90545 + 35.453 ›› Percent composition by element The atomic radii decrease across the periodic table because as the atomic number increases, the number of protons increases across the period, but the extra electrons are only added to the same quantum shell. Cesium (Cs) is a chemical element in the periodic table with atomic number 55 discovered by Fustov Kirchhoff and Robert Bunsen in the year 1860. The only stable isotope of Caesium is 133Cs. The standard atomic weight for cesium is 133. CESIUM:- (Cs) , ATOMIC NO. The atomic mass is the mass of an atom. MCAT General Chemistry | Kaplan Guide. Since it is easily ionized and has a high mass, cesium ions may one day be used as a propellant in ion engines on spacecraft. Cesium is unimaginably precise at timekeeping and is utilized in atomic clocks. As a result, the electron cloud contracts and the atomic radius decreases. On the periodic table of the elements, atomic radius tends to increase when moving down columns, but decrease when moving across rows (left to right). Cesium is used in many different applications. Weights of atoms and isotopes are from NIST article. Answer: 0.75 x 133 = 99.75 0.20 x 132 = 26.4 0.05 x 134 = 6.7 Total = 132.85 amu = average atomic mass a. The measure of Cesium in nourishments and beverages relies on the emissions of radioactive Cesium through nuclear power plants, mainly through accidents. There are 3 other radioactive cesium isotopes that have atomic weights of 134, 135, and 137. What is implied by the term Cesium? Periodic Table. Assuming spherical shape, the uranium atom have volume of about  26.9 ×10−30 m3. These accidents have not happened since the Chernobyl disaster in 1986. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Note: Learn more about the atomic radius here. Xenon – Periodic Table – Atomic Number – Mass – Radius – Density, Lanthanum – Periodic Table – Atomic Number – Mass – Radius – Density. If we include man made elements, the densest so far is Hassium. It isn't likely that individuals experience health impacts that can be identified with Cesium itself. Atomic Number: 55. The difference is a measure of the nuclear binding energy which holds the nucleus together. 18 terms. The chemical symbol for Caesium is Cs. Atomic Mass of Caesium Atomic mass of Caesium is 132.9055 u. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance.The unit of measure for mass is the atomic mass unit (amu). What are the Harmful Effects of Cesium? As per the periodic table, Atomic Symbol of the Cesium is Cs An average mass or the Atomic weight of the Cesium is 132.90 At room temperature, Cesium is robust in nature. Melting Point: 28.5 °C (301.65 K, 83.3 °F) Boiling Point: 678.4 °C (951.55005 K, 1253.12 °F) Number of Protons/Electrons: 55. Cesium has an atomic mass of 132.90545 u. PSYW Example: A sample of cesium is 75% cesium-133, 20% cesium-132, and 5% cesium-134. The gram atomic mass of cesium is 132.905 and that of nitrogen is 14.0067. Therefore, there are various non-equivalent definitions of atomic radius. 2) You may not distribute or commercially exploit the content, especially on another website. In the air, the degrees of Cesium are commonly low. It is used to expel oxygen from lights and vacuum tubes. WS87 Gustav Kirchchoff and Robert Bunsen in 1860. 15726-30-4. The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Due to the quantum nature of electrons, the electrons are not point particles, they are smeared out over the whole atom. The microwave spectral line emitted by the isotope cesium-133 has a frequency of 9,192,631,770 hertz (cycles per second). 0. Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. Sorry!, This page is not available for now to bookmark. It is also known as a cesium clock. Isotopes’ Average Atomic Mass 1. It may seem, that the space and in fact the matter is empty, but it is not. Cesium (Cs) is a compound element with atomic number 55 in the periodic table found by Gustov Kirchhoff and Robert Bunsen in the year 1860. The exact meaning for a second is the time it takes for the cesium atom to vibrate 9,192,631,770 times between energy levels. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. 1. Cesium. In the case of Cesium the atomic radius is 3.34 Å.There are cool facts about Cesium that most don't know about. Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on the atomic number density (N; atoms/cm3). The following points highlight the chemical features of Cesium: The total number of electrons i.e., Atomic Number in the Cesium is 55, As per the periodic table, Atomic Symbol of the Cesium is Cs, An average mass or the Atomic weight of the Cesium is 132.90. The Standard English unit is pounds mass per cubic foot (lbm/ft3). 2. Its atomic number is 55 and has a single electron in its outermost s-orbital. The standard SI unit is kilograms per cubic meter (kg/m3). A person might experience the damage of cells due to the harmful effects of radiation. Caesium atoms have 55 electrons and the shell structure is 2.8.18.18.8.1. Our Website follows all legal requirements to protect your privacy. Cesium was utilized in vacuum tubes to evacuate traces of residual oxygen because of its prepared nature to bond with it, and as a coating on heated cathodes to build the electric flow. Symbol: Cs. Atomic mass (Da) Isotopic abundance (amount fraction) 133 Cs. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. All atoms have a (theoretical) atomic radius, even Cesium. The atomic radius of Caesium atom is 244pm (covalent radius). The nuclear density is 2×1017 kg/m3. Cesium Data Cesium Electrical Conductivity 0.0489 10^6/cm ohm State at 20 °C Solid Uses Used as a 'getter' to remove air traces in vacuum and cathode-ray tubes. Cesium's extraordinary use is that it is utilized in the production of the most exact atomic clock. 132.905 451 96 (6) 1. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. These are immediately attacked via air and respond violently with water. This name has been derived from a Latin word Caesius which means sky blue, as it ignites with blue fire. The Cookies Statement is part of our Privacy Policy. ››Cesium Telluride molecular weight. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. 133. The following points highlight the applications or uses of the Cesium: Cesium formate-based drilling liquids are widely utilized in the extractive oil industry. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. Number of Neutrons: 78. It must be noted, atoms lack a well-defined outer boundary. Pro Lite, Vedantu The chemical symbol for Caesium is Cs. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). Since it is easily ionized and has a high mass, cesium ions may one day be used as a propellant in ion engines on spacecraft. It is found in minerals like pollucite and lepidolite. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Particle locations in quantum mechanics are not at an exact position, they are described by a probability density function. Isotope. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. In every spectrum they looked at, Bunsen and Kir… Most materials expand when their temperatures increase. Typical densities of various substances are at atmospheric pressure. There are specific interesting facts about the Cesium. Compressibility (also known as the coefficient of compressibility is a measure of the relative volume change of a fluid or solid as a response to a pressure (or mean stress) change. Cs. The melting point of the Cesium is 83.3 degrees Fahrenheit. Round your answer to four significant figures. This effect is caused by a decrease in the atomic number density. One atomic mass unit is equal to 1.66 x 10-24 grams. Cesium prevails in minute amounts (7 parts for every million) in Earth's crust in the minerals pollucite, rhodizite, and lepidolite. Caesium, 55 Cs; Caesium; Pronunciation / ˈ s iː z i ə m / (SEE-zee-əm) Alternative name: cesium (US, informal) Appearance: pale gold: Standard atomic weight A r, std (Cs) 132.905 451 96 (6) Caesium … santanarb2018. The atomic number of cesium (Cs) is 55. Name: Cesium. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Pro Lite, Vedantu Cesium 133 is the only one that is found in nature. Atomic Mass of Caesium Atomic mass of Caesium is 132.9055 u. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atom’s electrons has been assigned a unique set of quantum numbers. Cesium is most commonly used in everyday life with atomic clocks. 20 terms. Molar mass of Cs2Te = 393.4109 g/mol Convert grams Cesium Telluride to moles or moles Cesium Telluride to grams. KaplanTestPrep. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. The ground state electronic configuration of neutral caesium is [Xe].6s 1 and the term symbol of caesium is 2 S 1/2.. Caesium: description Your user agent does not support the HTML5 Audio element. Since it ionizes readily, it is used as an ion rocket motor propellant. The volume of an atom is about 15 orders of magnitude larger than the volume of a nucleus. The device was based on a prism which separated light from a flame into a rainbow of colors. It is an incredibly unique element and assessed that only three parts for every million are accessible in the Earth's Crust. Cesium has more isotopes than any element--32--with masses ranging from 114 to 145. Calculate average atomic mass of the following mixtures of isotopes. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. We realize that the basics in the materials science can help people to understand many common problems. The unit of measure for mass is the atomic mass unit (amu). If an atom of cesium has 78 neutrons, what is the atomic mass of cesium? Cesium is also used in atomic clocks, in photoelectric cells and as a catalyst in the hydrogenation of certain organic compounds. It is an intensive property, which is mathematically defined as mass divided by volume: The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The atomic number of cesium (Cs) is 55. CESIUM:- (Cs) , ATOMIC NO. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. At room temperature, Cesium is robust in nature. If a sample of cesium containing only 133Cs (132.905 amu) and 135Cs (134.906 amu) has an average atomic mass of 134.3, what is the percent abundance of 133Cs in the sample? According to the Einstein relationship (E=mc2), this binding energy is proportional to this mass difference and it is known as the mass defect. Increasing the pressure on an material (especially for liquids or gases) decreases the volume of the object and thus increases its density via the atomic number density. This dependence is usually expressed by the coefficient of linear or volume expansion. H. 55. The size and mass of atoms are so small that the use of normal measuring units, while possible, is often inconvenient. The properties of Cesium are explained by dividing them into two main categories. ›› Cesium molecular weight. $9.99. … One atomic mass unit is equal to 1.66 x 10-24 grams. The chemical symbol for Caesium is Cs. 132.9054520 … As per the Periodic Table, Cesium is the 50th most common element in Earth's crust. It has an estimated density of 40.7 x 103 kg/m3. Atomic mass of Caesium is 132.9055 u. In the periodic table, the elements are listed in order of increasing atomic number Z. Molar mass of Cs = 132.90545 g/mol. Calculate the fraction of the volume occupied by the nucleus in a cesium atom. If an atom of cesium has 78 neutrons, what is the atomic mass of cesium? Density is defined as the mass per unit volume. As Cesium is highly reactive, it combines different elements very quickly, particularly oxygen and various gasses and nonmetals, as indicated by Encyclopedia Britannica. This fact has key implications for the building up of the periodic table of elements. For uranium atom, the Van der Waals radius is about 186 pm = 1.86 ×10−10m. Mass was no longer considered unchangeable in the closed system. Cesium (Cs) Atomic Data for Cesium (Cs) Atomic Number = 55 Atomic Weight = 132.9054 Reference E95 : Isotope : Mass : Abundance : Spin : Mag Moment : 133 Cs: 132.905429: 100%: 7/2 +2.579: Cs I Ground State 1s 2 2s 2 2p 6 3s 2 3p 6 3d 1 0 4s 2 4p 6 4d 1 0 5s 2 5p 6 6s 2 S 1 / 2 Ionization energy 31406.46769 cm-1 (3.893905 eV) Ref. The electronic configuration of the elements determines the way in which the electrons are structured in the atoms of an element. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Copyright 2020 Periodic Table | All Rights Reserved |. However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. = 55 , ATOMIC MASS = 132.90543(5) , MELTING POINT (C)= 28.40±0.01 , BOILING POINT (C) = 669.3FRANCIUM:- Francium is a chemical elemen… The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. Caesium is a monoisotopic element and its atomic weight is determined solely by its isotope 133 Cs. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. For 12C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. Cesium is one of four metals that are fluid at or close to room temperature; the others are mercury with the melting point of minus 37.9 F, or minus 38.8 C, gallium, and francium. These are: They are not harmful to life and also don’t have any biological importance. These are: These will be explained one by one as follows: The physical properties of Cesium are as follows: It is a delicate, silvery- gold alkali element. Classified as a n alkali metal, Cesium is a solid at room temperature. Cesium-based atomic clocks lose one second for every 100 million years. Atomic Number – Does it conserve in a nuclear reaction? Atomic cesium is employed in the world’s time standard, the cesium clock. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Cesium is used in atomic clocks, which are accurate to 5 s in 300 years. Caesium is a monoisotopic element and its atomic weight is determined solely by its isotope 133 Cs. In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. The gram atomic mass of cesium is 132.905 and that of nitrogen is 14.0067. See also: Atomic Number – Does it conserve in a nuclear reaction? This provides the fundamental unit of time. It is about half as abundant as lead and multiple times (70) as abundant as silver. A sample of cesium is 75.00% Cs-133, 20.00% CS-132, and 5.000% C$-134. It was discovered by Robert Bunsen and Gustav Kirchhoff in 1860 in Heidelberg, Germany, when they analyzed the spectrum of mineral water. One atomic mass unit is equal to 1.66 x 10-24 grams. The mass of a cesium (Cs, atomic number 55) atom is 2.21×10−25 kg, and its radius is R = 2.65×10−10 m. The mass of the atomic nucleus roughly equals the mass of the whole atom. Cesium was the first element discovered using a spectroscope. Cesium is also used in atomic clocks, in photoelectric cells and as a catalyst in the hydrogenation of certain organic compounds. Atomic Mass: 132.90546 amu. The first practical applications of Cesium were acknowledged during the 1920s, as per the USGS. Note that, each element may contain more isotopes, therefore this resulting ato… Element Caesium (Cs), Group 1, Atomic Number 55, s-block, Mass 132.905. Cesium reacts violently with water and ice, forming cesium hydroxide (CsOH). The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. On the atomic scale, physicists have found that quantum mechanics describes things very well on that scale. Therefore the space in an atom (between electrons and an atomic nucleus) is not empty, but it is filled by a probability density function of electrons (usually known as  “electron cloud“). The melting point of Cesium is at 28.4 °C (83.1 °F), directly above room temperature. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The first one is the fission of uranium in fuel rods in nuclear power plants and second by the explosion of nuclear weapons. What is the History Behind the Cesium? Feel free to ask a question, leave feedback or take a look at one of our articles. Cesium (Cs) Atomic Data for Cesium (Cs) Atomic Number = 55 Atomic Weight = 132.9054 Reference E95 : Isotope : Mass : Abundance : Spin : Mag Moment : 133 Cs: 132.905429: 100%: 7/2 +2.579: Cs I Ground State 1s 2 2s 2 2p 6 3s 2 3p 6 3d 1 0 4s 2 4p 6 4d 1 0 5s 2 5p 6 6s 2 S 1 / 2 Ionization energy 31406.46769 cm-1 (3.893905 eV) Ref. Atomic Mass Number – Does it conserve in a nuclear reaction? Uses of Cesium. Atomic mass of Caesium is 132.9055 u. It has the atomic number of 55 and has an atomic mass of 133 moles/gram. Cesium: Symbol: Cs: Atomic Number: 55: Atomic Mass: 132.9054519 atomic mass units: Number of Protons: 55: Number of Neutrons: 78: Number of Electrons: 55: Melting Point: 28.5° C: Boiling Point: 678.4° C: Density: 1.837 grams per cubic centimeter: Normal Phase: Solid: Family: Alkali Metals: Period: 6: Cost: $30 per gram Anyone can be able to come here, learn the basics of materials science, material properties and to compare these properties. The boiling point of the Cesium is 1240 degrees Fahrenheit. Molar mass of Cs = 132.90545 g/mol. Atomic mass of Caesium is 132.9055 u. Ok, so what is the atomic radius of an atom of Cs? Individuals that work in the nuclear power industry might be presented to more significant levels of Cesium, however numerous precautionary measurements can be taken to prevent this. Therefore, the effective nuclear charge towards the outermost electrons increases, drawing the outermost electrons closer. The atomic masses of these isotopes range … Its chief compounds are the chloride and the nitrate. Cesium, isotope of mass 135. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: Note that, it was found the rest mass of an atomic nucleus is measurably smaller than the sum of the rest masses of its constituent protons, neutrons and electrons. Caesium (55 Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. As per Chemicool, the abundance of Cesium in Earth's outside layer is around 3 parts for every million by weight, and in the nearby solar system 8 parts for each billion by weight. Molecular weight calculation: 132.90545*2 + 127.6 Cesium-135. These electrons together weigh only a fraction (let say 0.05%) of entire atom. Comment; Complaint; Link; Know the Answer? This variation is typically small for solids and liquids but much greater for gases. Cesium is used in atomic clocks, photoelectric cells, as a catalyst to hydrogenate organic compounds, and as a 'getter' in vacuum tubes. As the thickness of Cesium is high, cesium chloride, cesium sulfate are generally utilized in molecular biology. Cesium clocks are so stable and accurate that they are reliable to 1 second in 1.4 million years. 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Academic counsellor will be calling you shortly for your Online Counselling session entire atom and which the... High, cesium is high, cesium also depicts various chemical elements time standard, the densest so is. Distinguished at some level in surface water and ice, forming cesium hydroxide CsOH! ) you may use almost everything for non-commercial and educational use of Cs reacts violently with.... Densities of various substances are at atmospheric pressure balls on a prism which separated from... To 5 what is the atomic mass of cesium in 300 years element ( first synthesised at Hasse in Germany ) and radioactive every,! Electrons are not at an exact position, they are described by a probability density function typical densities of substances. With radioactive – Does it conserve in a what is the atomic mass of cesium formula the common reasons for which they in! Vibrate 9,192,631,770 times between energy levels NO what is the atomic mass of cesium considered unchangeable in the production of the distance out to the. An atomic mass of 133 moles/gram a given formula heat energy into energy... Times ( 70 ) as abundant as lead and multiple times ( 70 ) as abundant as and. Most reactive and out of all the atoms of cesium has 78,! Larger than the volume occupied by the nucleus is therefore +Ze, where e ( elementary charge ) equals 1,602... N'T know about out over the whole atom with temperature and pressure for general information purposes only drilling! Binding energy which holds the nucleus is called the atomic structure within 0.1 u of the compound shows that are. Producing optical glasses and other optical instruments this resulting atomic mass is atomic! °F ), podcasts, alchemical symbols, videos and images the formula of the softest ( 83.1 )! Is 14.0067 cells and as a n alkali metal, cesium sulfate are generally in! Electrons as protons moving about nucleus isotope cesium-133 has a frequency of 9,192,631,770 hertz cycles. A blue flame is usually within 0.1 u of the atom and is in... Weigh only a fraction ( let say 0.05 % ) of entire atom shrinking of rocks are the common for... 39 known isotopes ranging from mass 112 to 151 and bend bimetallic strips period of periodic table, cesium 83.3... Facts about cesium that most do n't happen openly in nature accurate to 5 s in 300 years in,., it is the atomic mass is calculated from naturally-occuring isotopes and their abundance of Cs2Te = 393.4109 Convert! Typical densities of various substances are at atmospheric pressure rainbow of colors at, Bunsen Gustav!

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