Editing Heat capacity (section)

=== Variation with temperature ===
[[File:Heat capacity of water 2.jpg|thumb|403x403px|Specific heat capacity of water<ref>{{Cite web |title=Heat capacity of water online |url=https://www.desmos.com/calculator/wicmrvrznj?lang=ru |access-date=2022-06-03 |website=Desmos |language=ru}}</ref>]]The variation can be ignored in contexts when working with objects in narrow ranges of temperature and pressure. For example, the heat capacity of a block of [[iron]] weighing one [[pound (mass)|pound]] is about 204&nbsp;J/K when measured from a starting temperature ''T''&nbsp;=&nbsp;25&nbsp;°C and ''P''&nbsp;=&nbsp;1&nbsp;atm of pressure. That approximate value is adequate for temperatures between 15&nbsp;°C and 35&nbsp;°C, and surrounding pressures from 0 to 10 atmospheres, because the exact value varies very little in those ranges. One can trust that the same heat input of 204&nbsp;J will raise the temperature of the block from 15&nbsp;°C to 16&nbsp;°C, or from 34&nbsp;°C to 35&nbsp;°C, with negligible error.