FORM 4: 4.5 MEANINGS

ITEM	MEANING
THERMAL EQUILIBRIUM	Thermal equilibrium between two objects is a condition where both objects have the same temperature and there is no net flow of heat between the two objects.
HEAT CAPACITY	The heat capacity of a body is the amount of heat that must be supplied to the body to increase its temperature by 1 oC.
SPECIFIC HEAT CAPACITY	The specific heat capacity of a substance is the amount of heat that must be supplied to the increase the temperature by 1 oC for a mass of 1 kg of the substance.
LATENT HEAT	Latent heat is the heat absorbed or the heat released at constant temperature during a change of phase.
LATENT HEAT OF FUSION	Latent heat of fusion is the heat absorbed by a melting solid.
LATENT HEAT OF VAPORISATION	Latent heat of vaporisation is the heat absorbed during boiling.
SPECIFIC LATENT HEAT	The specific latent heat of a substance, l is the amount of heat required to change the phase of 1 kg of the substance at a constant temperature.
SPECIFIC LATENT HEAT OF FUSION	The specific latent heat of fusion of a substance is defined as the amount of heat required to change 1 kg of the substance from solid to liquid phase without a change in temperature.
SPECIFIC LATENT HEAT OF VAPORISATION	The specific latent heat of vaporisation of a substance is defined as the amount of heat required to change 1 kg of the substance from liquid to gaseous phase without a change in temperature.
BOYLE’S LAW	Boyle’s law states that for a fixed mass of gas, the pressure of the gas is inversely proportional to its volume when the temperature is kept constant.
CHARLES’ LAW	Charles’ law states that for a fixed mass of gas, the volume of the gas is directly proportional to its absolute temperature when its pressure is kept constant.
PRESSURE LAW	Pressure law states that for a fixed mass of gas, the pressure of the gas is directly proportional to its absolute temperature when its volume is kept constant.
ABSOLUTE ZERO OF TEMPERATURE	The absolute zero of temperature is the lowest possible temperature which is – 273 oC.