Question

Pure water boils at __________ $°\mathrm{C}$ and freezes at __________$°\mathrm{C}$ at normal atmospheric pressure.

• A. $100$
• B. $0$

Answer 1

Boiling point

• The boiling point is the temperature at which liquid start changing into a gaseous state.
• The boiling point is different for different liquids.
• The boiling point of water is $100°\mathrm{C}$ , which means water changes into vapours at $100°\mathrm{C}$ .

Freezing point

• The freezing point is the temperature at which liquid changes into solid-state.
• The freezing point of water is $0°\mathrm{C}$ , which means water changes into ice at $0°\mathrm{C}$ .

So, Pure water boils at $\underline{100}$ $°\mathrm{C}$ and freezes at $\underline{0}$$°\mathrm{C}$ at normal atmospheric pressure.