Question

Boiling point of water at normal atmospheric pressure is ______.

• A. $0^{\circ }C$
• B. ${100}^{\circ }C$
• C. ${110}^{\circ }C$
• D. $-4^{\circ }C$

Answer 1

Answer: (B)

${100}^{\circ }C$

The boiling point of a liquid is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid. The boiling point of liquids varies with and depends upon the surrounding environmental pressure.

The normal boiling of a liquid is the special case in which the vapor pressure of the liquid equals the defined atmospheric pressure at sea level i.e., at 1 atmosphere (atm) is ${100}^{0}C$.