V/T=k

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V/T=k

V/T=k

To a very close approximation, helium vapour is a perfect gas. This means that the bulk modulus of helium vapour can be obtained from the ideal gas equation. We know that PV = N k T so that P = N k T / V. dP/dV = -N k T / V^2

The bulk modulus is defined as K = =V dP/dV , therefore K = N k T / V.

Here, N = Avogadro's number, k = Stephan-Boltzmann constant, T is the absolute temperature and V is the gas volume. You will probably notice that the bulk modulus is dependent on T / V (in other words pressure) which is exactly what we would expect.... at higher pressure, gasses are harder to compress.