- #1

- 128

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We know that the molecules of the gas exert a pressure on the piston.

Now let us put twice as many molecules in this tank, so as to double the

density, and let them have the same speed, i.e., the same temperature.

At this point my book says :

"If we consider the true nature of the forces between the atoms, we would expect

a slight decrease in pressure because of the attraction between the atoms

**, and**

a slight increase because of the finite volume they occupy."

a slight increase because of the finite volume they occupy."

I'm not able to understand what does the underlined sentence mean, can you help ?