Pressure–volume work on a gas in a cylinderसिलिंडर में गैस पर दाब–आयतन कार्य

NCERT Fig 5.5 · interactive diagram

Parts and their functions

• Gas in a cylinder (सिलिंडर में गैस) — One mole of an ideal gas; the piston is frictionless and weightless.
• Piston (पिस्टन) — Area A. Force on it = pₑₓ × A; moving it a distance l does work pₑₓ × A × l = pₑₓ × |ΔV|.
• External pressure (बाह्य दाब) — Constant external pressure compressing the gas.
• Volume change ΔV = V_f − V_i (आयतन परिवर्तन ΔV = V_f − V_i) — In compression ΔV is negative, so w = −pₑₓΔV is positive (work done on the system). In expansion w is negative.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 5.5. Report a mistake