CHANGE IN STATE AND LATENT HEAT
The conversion of a substance trom one state to another state at a detınite temperature is known as change in state. The state of substance can be changed by changing temperature or pressure.
During the change in state the temperature of the substance does not change but internal potential energy of molecules change.(kinetic energy of molecules remain same).
The amount of heat energy required by a substance from one State to another state at atmospheric pressure is called latent heat of that substance.
Terms Related to Change of State
1. Melting point. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point. When a solid melts, its temperature remains the same. Melting point of those substances which contract
upon melting reduces on increasing pressure. On the other hand melting point of those substances which expand upon melting increases with increasing pressure.
Freezing point The temperature at which a liquid becomes solid at the atmospheric pressure is called its freezing point.
Boiling point The temperature at which a liquid starts boiling at the atmospheric pressure is called its boiling point. Boiling
is a bulk phenomenon. Boiling point of water increases in presence of impurities in the water. Boilıng point increases on increasing pressure upon liquid that's why foodcooks comparatively faster in pressure cooker.
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