Question

on the basis of kinetic theory of gases explain the concept of positive and negative work done by a gas​

Answer 1

Answer:

For the work done on a gas, we have: ... Positive work is done on the gas when the gas is compressed; negative work is done on the gas when the gas expands. zero work is done on the gas when the gas volume is fixed.

Answer 2

Consider a setup where a certain amount of a gas is contained in a cylinder that has a moving, frictionless piston. When the gas expands, molecules that collide with the piston lose momentum.

• This causes the piston to experience pressure and move outward via a limited distance. In this case, the gas has a beneficial effect on the piston. The volume of the gas has increased. The piston's that is work on the gas is negative. Molecules that collide with the piston when the gas is being compressed receive motion from it.
• Molecules that collide with the piston when the gas is being compressed receive motion from it. The gas feels the push of the piston as it moves inward across a fixed distance. In this case, the gas exerts negative pressure on the piston. The volume of the gas is decreasing. The piston applies positive force to the gas.

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