Thermodynamics Lab

Everywhere

• Topic tabs (under the title) switch between simulations in this lab. Some topics have smaller buttons under the stage for their screens.
• Teach shows live equations with the current numbers and "What to notice" points. Practice gives a numeric problem and a quiz.
• Move the sliders or tap the chips in the right-hand panel. The readings box updates live.
• Pause / Restart control the animation. Clean view hides everything except the stage, for projecting or recording; press Esc to leave it.
• In Practice, type a number (e.g. 12.5 or 3.2e-10), press Check or Enter. Show it on the stage sets the simulation to that problem.
• Nothing is saved: scores reset when the page is reloaded.

Five topics along the top

• Work & P–V diagram: drag the volume of a gas in a cylinder and watch the work ∫P dV add up, at fixed T or fixed P; compare the work along different routes between the same two states; and trace a clockwise or anticlockwise cycle whose enclosed area is the net work.
• Processes: isobaric, isothermal, adiabatic and isochoric from the same start with W, ΔU and Q for each; adiabatic compression of an insulated cylinder (TV^(γ−1) = constant); and the same heat given at constant V and constant P, which shows why Cp − Cv = R.
• First law: Q = ΔU + W as three bars with the signs made explicit; internal energy U = (f/2)nRT; and an isothermal against an adiabatic expansion side by side.
• Heat engines: the animated Carnot cycle on a P–V diagram with the piston and the two reservoirs; the energy-flow diagram with η = 1 − T₂/T₁; and the refrigerator / heat pump with its COP.
• Second law & entropy: hot and cold bodies in contact with ΔS for each and the total; the Kelvin–Planck and Clausius statements as forbidden machines; and free expansion into a vacuum with ΔS = nR ln(V₂/V₁).

Teach and Practice

• Teach shows the equations with your numbers and notes for each view. Practice gives a numerical problem for the current view — Check the answer, Show it on the stage, or ask for a New problem — plus a quick-check quiz.

Language

• Choose English or বাংলা once on the home page (top right); every lab then opens in that language — tabs, controls, readings, equations, notes, problems and quizzes.

Full guide with teaching tips: User manual (also as a PDF).