Loschmidt’s constant

Loschmidt s constant, sometimes quoted as Avogadro s constant) it is... 

Loschmidt s constant (Loschmidt number) Symboi JVl. The number of particles per unit voiume of an ideai gas at STP. it has the value 2.686 763(23) x 10 m and was first worked out by the Bohemian physical chemist Joseph Loschmidt (1821-95). 

The proportionality constant is called Avogadro s constant in some countries and Loschmidt s constant in others. It is known from experiment to have the value... 

About units. For our survey of measured spectra and the comparisons with theory that follow in Chapters 5 and 6, it is useful to remember that frequencies are often expressed in units of Hertz, or of cm-1, or in cycles per 2n seconds. In order to avoid confusion we shall distinguish the notations f,v=f /c, and co = 2nf, respectively, where c designates the speed of light in vacuum. Similarly, gas densities will be expressed as number densities, n, the number of particles per volume, or in units of amagat, q = n/Na, where Na is the number of particles per cubic centimeter of the gas under consideration for most gases of interest Na is about equal to Loschmidt s number, Na Nl = 2.686763 xlO19 cm-3 amagat-1, the particle density of an ideal gas at standard temperature and pressure. The values of fundamental constants are taken from [124],... 

Thus, each of the nN atoms of the crystal contributes 3 kg to the specific heat. If the crystal contains one mole of molecules (or formula units) with s atoms per molecule, we have sN atoms, where is Loschmidt s number. Introducing the gas constant R = N kg, the molar specific heat is therefore given by... 

General Physical Constants Gas constant Loschmidt s number Speed of light in vacuum... 

Johann Josef Loschmidt first calculated the value of Avogadro s number often referred to as the Loschmidt number in German-speaking countries Loschmidt constant now has another meaning). 

Amedeo Carlo Avogadro (1776-1856) was an Italian chemist, most noted for his contributions to the theory of molarity and molecular weight. In 1811, he declared the hypothesis of what we now call Avogadro s law Equal volumes of gases, at the same temperature and pressure, contain the same number of molecules. Hence, the gas laws of Boyle, Mariotte and Cay-Lussac in combination with Avogadro s Law can be generalized by the ideal gas law. The Avogadro constant Na, that is, the number of molecules in one mol is 6.022 x 10 mol is named in his honor. The numerical value of /Va was first estimated in 1865 by Johann Josef Loschmidt (1821-1895), an Austrian scientist. 

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