CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Endothermic reaction, image 1 of 2. In thermodynamics, the word endothermic (within-heating) describes a process or reaction in which the system absorbs energy from the surroundings in the form of heat. The concept is frequently applied in physical sciences to, for example, chemical reactions, where thermal energy (heat) is converted to chemical bond energy.
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