ৌ ઁ2ߨҗ ߊࢿ ୋب(بੑ : ৌӝҙ(Cyclic Heat Engines)) ৌӝҙ (cyclic heat ৌ(heat) ੌ(work) engine) ৌ(heat) ֢ܰ ӝҙ PVࢶب