eksotermne

Eksotermne refers to processes or reactions that release heat to their surroundings. The term is derived from Greek exo meaning outside and therme meaning heat. In thermodynamics, an exothermic process has a negative enthalpy change (ΔH < 0): energy flows from the system to the surroundings, which typically causes the ambient temperature to rise.

In practical terms, exothermic reactions feel warm or hot as they proceed. Common examples include combustion of fuels (such as burning hydrocarbons), cellular respiration in living organisms, oxidation of metals, and the hydration of cement. Neutralization reactions between acids and bases also commonly release heat. Exothermic behavior is important for energy considerations, safety, and material design.

Measuring exothermic heat is a core part of calorimetry. Calorimeters quantify the heat released by a reaction, while techniques such as differential scanning calorimetry can identify exothermic events during processes like polymer curing or phase transitions. Exothermic behavior is contrasted with endothermic processes, which absorb heat from the surroundings and have a positive ΔH.

The concept of eksotermne is used across chemistry, physics, engineering, and education. It underpins applications from practical items like hand warmers and self-heating cans to industrial processes and energy management, where the control of heat release is essential.