Non-endothermic

Describing a process or reaction that does not absorb heat from its surroundings. Instead of taking in energy, non-endothermic processes either release energy (exothermic) or involve no significant heat exchange. This term is frequently used in chemistry and physics to classify various reactions, phase transitions, and physical changes. The absence of heat absorption implies that the system's internal energy either remains constant or decreases, often leading to an increase in the temperature of the surroundings.

Non-endothermic meaning with examples

• The burning of wood is a non-endothermic process, releasing heat and light as it proceeds. The combustion of methane in a gas stove exemplifies this, with thermal energy being produced rather than absorbed. This contrasts with processes where heat is required to break bonds or cause a change in state. Consequently, the surroundings become hotter as the reaction proceeds.
• The condensation of steam into water on a cold surface is a non-endothermic process. During this phase transition, the steam releases heat to its surroundings, demonstrating a natural shift in state. This is readily observable on a cold mirror. The released heat would then increase the mirror temperature.
• Many neutralization reactions between acids and bases are non-endothermic. When hydrochloric acid reacts with sodium hydroxide, the reaction releases heat, raising the solution's temperature. The heat produced is transferred to the environment.
• The rusting of iron is a non-endothermic oxidation reaction. The iron reacts with oxygen, producing iron oxide (rust), which releases some heat to the surroundings. You can see this happen when metal exposed to water and air becomes reddish brown.
• The freezing of water into ice is a non-endothermic process. This is shown when heat is released from water into the cold surroundings. You can observe this when you put water in the freezer.