Three differences between physical reaction and chemical change.

1. Physical change is a temporary change while chemical change is a permanent change.
2. A physical change affects only physical properties i.e. shape, size, etc. while chemical change both physical and chemical properties of the substance including its composition.
3. A physical change involves very little to no absorption of energy while during a chemical reaction, absorption and evolution of energy take place.

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)