A liquid begins to boil when?
-
A.
its vapour pressure is equal to the vapour pressure of its solid at the given temperature -
B.
molecules start escaping from its surface -
C.
its vapour pressure equals the atmosphere pressure -
D.
its volume is sightly increased
Correct Answer: Option C
Explanation
The normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure.