In an isothermal expansion of a diatomic gas having a volume V1 = 2 m ^ 3, the pressure P1 = 0.5 MPa, there was a reduction of pressure to p2 = 0,4 MPa, and then the gas is squeezed isobarically to the original volume. Draw a graph of this process in the coordinates of P-V show the graph of gas work during this process. Define the work committed gas and a change in its internal energy.

Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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