Question

explain mechanical or the PV work ( within 100 words )

Answer 1

$\mathbb{MECHANICAL\: OR (P -V work ); }$

The work performed when the system changes its volume under the influence of an external pressure is pressure -volume work .
Let us consider a cylinder fitted with a frictionless piston filled with the gas if the internal pressure on the Piston (due to the gas) is greater than the external pressure .
The Piston movee out there by the gas gets expanded the gas inside the Piston does work on the surrounding hence energy of the system (gas) decreases .
On the other hand if the external pressure is higher than internal pressure the Piston moves in words compressing the gas the work is done on the system .
In discuss the energy of the system increases if the energy does not flow out of the system .

# be brainly

Answer 2

$\huge\mathfrak\red{Answer :}$


$\huge\textbf{Mechanism or P-V Work :}$

[P-V work = Pressure Volume Work]


It is done when we have a volume change against the external constant Pressure....

Let us consider a cylinder containing a gas.. The cylinder is fitted with a fiction less piston..

If external pressure is applied but slightly lower than internal pressure; then the pressure will move upward to a length (l) until external pressure becomes equal to internal pressure..

If V = Volume

P = Pressure

and

a = Area of cross - section.

Then;

Work done by system = P × a × l

[As a × l = V]

Work done by system = P ∆V

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