basic

Joule-Thomson Temperature Drop Calculator

ΔT = μ_JT · ΔP — isenthalpic throttling.

Compute the temperature change of a real gas during an isenthalpic (Joule-Thomson) throttling expansion: ΔT = μ_JT × ΔP, where μ_JT is the gas-specific Joule-Thomson coefficient (positive at typical conditions for most gases below their inversion temperature, so they cool on expansion; negative for H₂ and He at room T, so they heat up).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

K/atm
atm

Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ΔT = μ_JT · ΔP.

In depth

Compute the temperature change of a real gas during an isenthalpic (Joule-Thomson) throttling expansion: ΔT = μ_JT × ΔP, where μ_JT is the gas-specific Joule-Thomson coefficient (positive at typical conditions for most gases below their inversion temperature, so they cool on expansion; negative for H₂ and He at room T, so they heat up).