Isothermal

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With isothermal (gr: ἴσος ISOS "equal"; θερμός thermos "warm") is generally a temporal or spatial constancy of the temperature referred to.

An example of temporal isothermal energy is the slight fluctuation in the core body temperature of homoiothermal organisms. The low amplitude of the temperature in the climatic diagram of places close to the equator is also referred to as isothermal, whereby the large daily fluctuations are particularly not considered. One speaks of an isothermal change of state if the temperature is kept constant.

The presence of a small spatial temperature gradient is also referred to as isothermal. In particular, a line or area in a two- or three-dimensional temperature field on which the temperature is constant is called an isotherm .