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Thomson's scale enables a perfect gas to be defined, and the deviations of the properties of ordinary gases from those of such a gas to be observed and measured.

The relation between the temperature, pressure, and weight of steam is not quite proportional to the volume, because steam is not a perfect gas, and does not, therefore, strictly follow Mariotte’s law.

Contracting, according to Lane's law, its temperature must rise until its density becomes such that it no longer behaves as a perfect gas.

They are the cases of mixtures of perfect gases, and of very dilute solutions.

Instead of behaving like a perfect gas, in which every quark goes its own way independent of the others, the plasma seemed to act like a liquid.