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Measuring Boltzmann’s constant with carbon dioxide

In this paper we present two experiments to measure Boltzmann’s constant—one of the fundamental constants of modern-day physics, which lies at the base of statistical mechanics and thermodynamics. The experiments use very basic theory, simple equipment and cheap and safe materials yet provide very precise results. They are very easy and quick to perform, allowing this fundamental constant to be brought to the high-school level as a hands-on experience.