Likely to be altered or degradation when subjected to heat
In chemistry, the lability of a compound pertains to the capability of that substance to undergo a change. Thus, the term heat-labile describes one that is capable of changing or destruction when subjected to heat. In biochemistry, a molecule that is heat-labile means it can exist transiently in a particular conformation by means of heat before assuming a lower energy or stable conformation. In another context, a heat-labile molecule means it can also be destroyed upon exposure at high temperatures. For instance, a heat-labile protein may lose its structure as it unfolds at very high temperature. The opposite of heat-labile in this regard is heat-stable. A heat-stable substance is capable of maintaining its form, structure, and function even at high temperatures.