It is
Avogadro's Law which states:
Quote:
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Avogadro’s law, a statement that under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules.
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Therefore at any given temperature and pressure, whether the cylinder is filled with nitrogen, water vapor, carbon dioxide, or other, there will be a calculated number of molecules. Furthermore, 1 degree rise in temperature provides for the exact expansion rate regardless of the gas. It then boils down to how much thermal energy is required to raise the temperature of any given gas by 1 degree. This is Thermal Density.