# Doubt from thermodynamics

I did by using simple force equation balance.

Given massless piston so net force on pistons is zero at any instant.Take initial and final instants .

x in the spring force represents compression in it which is (h/16)

Given:

P(initial)=1 atm(NTP)

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Thanks !! I understood from your solution how to do it by the force method... But please can you see where I was wrong in that method of doing by WE therom @Bhuvanitha_2020