In science, isothermal refers to processes or reactions that occur at constant temperature. In isothermal processes or reactions the following differential results:

dT = 0

meaning that differential changes in the temperature T of the system do not occur. The term ‘isothermal’, from the French isotherme, from is- + -therme, supposedly, was first used in 1826. [1]

1. Merriam-Webster Collegiate Dictionary.

External links
‚óŹ Isothermal processes – Wikipedia.

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