1. of or relating to a chemical reaction that releases heat energy to the surroundings
Usage: chemistry term; also spelled exothermic

Examples

• Burning wood is an exothermal process that produces flames and warmth.
• The exothermal reaction between hydrogen and oxygen releases significant energy.
• Students observed the exothermal decomposition of hydrogen peroxide in the lab.
• Neutralization reactions are typically exothermal and raise the temperature of the solution.
• The exothermal nature of combustion makes it useful for generating power.