Changing states: melting, freezing and more · अवस्था परिवर्तन: पिघलना, जमना और वाष्पन
A free Chemistry lesson for Class 4 children.
Matter can change from one state to another when we heat it or cool it.
When ice is heated, it changes into water. This is melting.
When water is cooled a lot, it becomes ice. This is freezing.
When water is heated, it changes into water vapour. This is evaporation.
When water vapour cools, it changes back into water. This is condensation.
Water freezes at 0 degrees Celsius and boils at 100 degrees Celsius.
Wet clothes dry in the Sun because the water in them evaporates.
Drops form on a cold glass because water vapour in the air condenses on it.