Class 11 Physics simulations · Thermodynamics

Heating gas at constant pressure

Weights hold the piston pressure fixed while you heat the gas. Track Q, W and ΔU.

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What to notice

Only part of the heat raises internal energy; the rest does work lifting the piston.

Key relation

W = nRΔT, Q = nC_pΔT, ΔU = nC_vΔT

Try this

Switch to a diatomic gas. What fraction of Q becomes work now?

What you can change

• Amount of gas: 0.1 to 2 mol
• Pressure: 50 to 300 kPa
• Initial temperature: 250 to 400 K
• Final temperature: 300 to 800 K
• Gas: choose Monatomic (Cv = 3R/2), Diatomic (Cv = 5R/2)

More in Thermodynamics

• Adiabatic compression and expansion
• Carnot heat engine
• First law of thermodynamics
• Entropy in isothermal expansion
• Petrol engine (Otto cycle)
• Work from a rectangular P–V cycle
• Refrigerator and heat pump
• Gas under a piston

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