# Joule-Thomson effect

> English word · Noun

## Definitions
1. The temperature change of a real gas or liquid (as differentiated from an ideal gas) when it is forced through a valve or porous plug while kept insulated so that no heat is exchanged with the environment.

## Etymology
Named after James Prescott Joule and William Thomson, 1st Baron Kelvin, who discovered it in 1852.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/joule-thomson-effect