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sci.Joule-Thomson-coefficient Calculator
Calculates the Joule-Thomson coefficient μ_JT = (∂T/∂P)_H and determines whether a gas cools or heats on expansion. Most real gases cool on throttling at room temperature (μ_JT > 0) — hydrogen and helium heat on expansion at room temperature and must be pre-cooled below their inversion temperature before Linde liquefaction.
Inputs
Cp Kj Kg K
Energy to raise 1 kg of material by 1°C (J/kg·K). Water: 4,186 J/kg·K. Metals are typically 100–900 J/kg·K.
T K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Alpha K Inv
Reference formula or conversion factor shown for context.
Rho Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
Joule-Thomson coefficient μJT (K/Pa)
Sample size or count used in the calculation.
cooling on expansion?
Sample size or count used in the calculation.
αT product
The result of multiplying all input values together.
μJT = (2αT-1)/(ρCp)
Reference formula or conversion factor shown for context.
ideal gas
Reference formula or conversion factor shown for context.