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What is the advantage of considering each of the following in calculating the work done by...

  1. What is the advantage of considering each of the following in calculating the work done by an expanding gas?

    1. a) a massless piston

    2. b) a perfectly fitting piston

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Answer #1

Massless piston means the kinetic energy and the gravitational potential energy of the piston will be zero. So, no work will be done on the piston and all of the work can be transferred to the surroundings.

A perfectly fitting piston means there will be no energy loss due to friction. So, the calculated work done will be more closer to the actual work done.

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