Specific heat capacity is a physical property of a substance that indicates how much heat energy is required to raise the temperature of a unit mass of that substance by one degree Celsius (°C). It is usually expressed in joules per kilogram per degree Celsius (J/kg·°C). Different materials have different specific heat capacities, which means they heat up and cool down at different rates. For example, water has a high specific heat capacity, meaning it can absorb a lot of heat without a significant change in temperature. This property is important in various applications, including climate regulation, cooking, and engineering, as it affects how substances respond to heat.