Flexi Says: Different substances respond to heat in different ways. If a metal chair sits in the bright sun on a hot day, it may become quite hot to the touch. An equal mass of water in the same sun will not become nearly as hot. We would say that water has a higher heat capacity than metal. The specific heat of a substance is the amount of energy required to raise the temperature of 1 gram of the substance by 1°C. The amount of heat absorbed by an object depends on both its substance and mass. If you have two objects made up of the same substance, the object with greater mass will absorb more heat.