irreversible change
Technical term used in physics, chemistry, and other sciences to describe a change that cannot be undone.
See also: 不可逆変化
In thermodynamics, an irreversible change involves an increase in entropy.
Synonym with the same meaning; 非可逆変化 is less common and may be considered a variant.
Compound of 非 (hi, 'non-'), 可逆 (kagyaku, 'reversible'), and 変化 (henka, 'change').