Specific Heat Capacity
The specific heat capacity of a substance is the amount of energy needed to change the temperature of 1 kg of the substance by 1°C. Different substances have different specific heat capacities. The table shows some examples.
Heat capacities of different substances
Substance Specific heat capacity in J / kg °C water 4181 oxygen 918 lead 128
specific heat capacity is measured in joules.
The equation for specific heat capacity is
Energy Transfrred by specific heat capacity is:
Energy Transfrred= mass x SPC x temp change
Temperature and heat (not the same thing)
Temperature and heat are not the same thing:
- temperature is a measure of how hot something is
- heat is a measure of the thermal energy contained in an object.
Temperature is measured in °C, and heat is measured in J. When heat energy is transferred to an object, its temperature increase depends upon the:
- the mass of the object
- the substance the object is made from
- the amount energy transferred to the object.
For a particular object, the more heat energy transferred to it, the greater its temperature increase.
Uses colour to show temperature; hottest areas are white and yellow, coldest are black, dark blue and purple.