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What Is an Isothermal Process in Physics?
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Pressure volume graph of adiabatic process
Graph of an isothermal process that maintains a constant temperature while pressure changes over time.
Yuta Aoki/Wikimedia Commons/CC BY-SA 3.0
By Andrew Zimmerman Jones
Updated January 19, 2019
The science of physics studies objects and systems to measure their motions, temperatures, and other physical characteristics. It can be applied to anything from single-celled organisms to mechanical systems to planets, stars, and galaxies and the processes that govern them. Within physics, thermodynamics is a branch that concentrates on changes of energy (heat) in the properties of a system during any physical or chemical reaction.