CBSE Class 9 Chemistry Matter in Our Surroundings
States of MatterStates of matter
Effect of Heat and Pressure on MatterThe change of solid into liquid state on heating is known as fusion and into gaseous state is called sublimation.
The heat required to change the state of matter without any change in temperature is called latent heat.
Decrease in pressure converts solid into liquids and liquids into gaseous state.
Evaporation and CondensationEvaporation is the process in which water is converted from liquid form to its vapour state.
The rate of evaporation depends on the surface area, temperature and humidity.
The process in which vapour changes its state to liquid is called condensation.