Thermodynamics problems, solved the way your professor does them
Five calculators built on standard textbook property tables for water, R-134a and ideal gases. Enter two properties, get the rest. SI and imperial units, no account, results computed in your browser.
Closed System
Piston-cylinder energy balance Q − W = m·Δu. Isothermal, constant-volume, constant-pressure, polytropic (solve n), and general processes.
Property Lookup
Any two properties in, the rest out. Water and R-134a auto-detect saturated vs superheated; ideal gases close P·v = R·T.
Nozzle
Steady-flow energy balance for exit velocity, heat transfer, or mass flow — with the kinetic-energy term handled exactly.
Heat Exchanger
Two-stream adiabatic balance ṁₕΔh = ṁ_cΔh. Solve duty, outlet states, or the missing mass flow.
Mixing Chamber
Two inlets, one exit: combined mass and energy balances solve mass flows and the exit state.
Learn the theory behind the numbers
Short guides on steam tables, energy balances and the unit traps that sink thermodynamics problems — each worked with numbers you can check by hand, then verify in the calculators.
Browse the learn guidesWhy these calculators
- Real textbook tables.Saturation and superheated tables for water and R-134a, ideal-gas tables for air, CO₂, CO, O₂ and NO₂ — the same tables in your course appendix, linearly interpolated between rows.
- Region detection built in.Enter P and T and the calculator checks Tsat, decides saturated vs superheated, and switches tables — the step students most often get wrong.
- Cross-validated.The engine replays 33 worked textbook problems (Cengel & Boles) and matches the published answers within table-reading tolerance.
- Private by construction.Everything runs in your browser. Your problem data never leaves the page.