Question

How can we observe the change, of a given piece of matter, from one state to another?

Answer 1

1. To change the state of any matter from liquid to solid, we can freeze the liquid up to its freezing point.
2. Eg: Water will convert into ice at $0°C$.
3. To change the state of any matter from liquid to gaseous state, we can heat up the matter up to its boiling state.
4. Eg: Water will change into vapor(gas) at $100°C.$