The isotherm It is an element and a tool that is essential when measuring the temperature of a certain area. On a cartographic plane, the isotherm is a curve that joins those points that present the same temperatures in a unit of time considered.
Thus, for the same area, a large number of planes can be designed that contain isotherms, for example, isotherms of a long-term mean temperature of the months of January, February, among others, or the isotherms of mean annual temperatures. .
On the other hand, the term is used to refer that this or that thing has the same temperature or a temperature that is characterized by remaining constant over time.
For his part, the isothermal process or isothermal process, turns out to be the reversible temperature change in a thermodynamic system, the aforementioned change being constant for the entire system. An example of the action of this process is the compression or expansion of an ideal gas that is in permanent contact with a thermostat; the gas is placed so that it makes thermal contact with another system of large heat capacity and that is at the same temperature as the gas. The heat will transfer very slowly making it easier for the gas to expand.
