Eksotermilisteks

Eksotermilisteks is an Estonian grammatical form derived from the adjective eksotermiline, meaning exothermic or heat-releasing. The form is used to express a change into an exothermic state for multiple items or phenomena, and is part of Estonian's translative mood, which marks becoming or turning into something. The singular equivalent is eksotermiliseks; eksotermilisteks is used when referring to more than one subject.

In science, exothermic processes release heat to the surroundings. In chemistry, the enthalpy change (ΔH) is typically negative for exothermic reactions, indicating that energy is emitted as heat. Common examples include combustion (burning fuels), many neutralization reactions, and certain crystallization or metal displacement processes. The released energy may appear as an increase in temperature, light, or other forms of energy transfer.

Usage and examples in Estonian texts often involve the translative form when describing a transformation. For instance, one might say, “Need reaktsioonid võivad eksotermilisteks muutuda” (These reactions may become exothermic) or refer to “eksotermilisteks nimetatud protsesside küszöad.” The form eksotermilisteks signals a change into an exothermic state for several items, as opposed to describing something that is already exothermic.

See also: endothermic, calorimetry, enthalpy.