Question

What is the vapor pressure of water at $100$ degrees Celsius?

Answer 1

$1$ atmosphere,

Explanation:
Vapour pressure or equilibrium vapour pressure or saturated vapour pressure is defined as the pressure exerted by a vapour in thermodynamic equilibrium with the condensed phases (solid or liquid) at a given temperature. At ${100}^{0}C$, the vapor pressure of water is $1$ atmosphere; i.e. ${100}^{0}C$ is the normal boiling point of water.