Class 11 Physics simulations · Thermodynamics

Entropy in isothermal expansion

Expand an ideal gas reversibly at constant temperature and connect heat to entropy.

Open the simulation

What to notice

Compression decreases gas entropy and releases heat to the reservoir.

Key relation

ΔS = nR ln(Vf/Vi); Qrev = TΔS

Try this

Set the volume ratio below one.

What you can change

• Final / initial volume: 0.25 to 4 ×
• Amount of gas: 0.5 to 3 mol
• Temperature: 200 to 600 K

More in Thermodynamics

• Adiabatic compression and expansion
• Carnot heat engine
• First law of thermodynamics
• Heating gas at constant pressure
• Petrol engine (Otto cycle)
• Work from a rectangular P–V cycle
• Refrigerator and heat pump
• Gas under a piston

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