How is heat capacity measured and what methods are used to determine it accurately?

Heat capacity is measured by determining the amount of heat required to raise the temperature of a substance by a certain amount. This is typically done using calorimetry, where the heat input and resulting temperature change are measured. Other methods include differential scanning calorimetry and specific heat capacity measurements using known formulas and constants. Accurate determination of heat capacity involves controlling variables, using precise instruments, and conducting multiple trials to ensure consistency and reliability of results.