The normal boiling point of a liquid is defined as?
-
the temperature at which its vapour pressure equals the atmospheric pressure
- the temperature at which bubbles begin to form
- the temperature at which the vapour pressure equals 1 temperature
- the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
- the temperature at which the space above the liquid is saturated
The correct answer is: A
Explanation
The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.