First, besides balancing the average force ⟨F⟩ and thus sustaining the average pressure ⟨P⟩=⟨F⟩/A of the gas, the interaction be...First, besides balancing the average force ⟨F⟩ and thus sustaining the average pressure ⟨P⟩=⟨F⟩/A of the gas, the interaction between the heavy piston and the relatively light particles of the gas is weak, because of a relatively short duration of the particle hits (Figure \PageIndex1).
