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<p>The following three definitions of the ideal gas which are in common use are proved to be in all respects mutually equivalent, each being necessary and sufficient for the others. (1) The ideal gas obeys Boyle's law, and its temperature scale agrees with the thermodynamic scale-that is, /b pv/ = R thetas . (2) The ideal gas obeys Boyle's law and Joule's law-that is (/b p/ nu )/sub thetas / = constant, and ( part epsiv / part nu )/sub thetas / = thetas ( part /b p// part nu )/sub nu /-/b p/ = 0. (3) The ideal gas obeys Boyle's law, and its Joule-Kelvin effect is zero-that is (/b p/ nu )/sub thetas / = constant, and rho = thetas ( part nu / part thetas )/sub /b p//- nu = 0. It is also frequently added that the s
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<br>Subjects: gases; thermodynamics; Heat flow, thermal and thermodynamic processes</div>
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