Task 20214.

The 4 liter cylinder under the piston, occupies a middle position is nitrogen. Piston stalled and gas heated until then. As long as the pressure rises to 2 atm. Then, having stopped the heating, the stopper released, causing the piston slowly climbed up to the stop and the gas pressure has taken the original value. Plot the observed and determine izoprotsessov heat Q communicated to gas. The initial gas pressure is equal to atmospheric accept. Piston friction against the walls of the vessel and the weight of the piston and its thickness neglected.