In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Heat capacity or thermal capacity is a physical property of matter , defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature .
Heat capacity is a measure of how much materials can store up heat as they change temperature .