What is it called when a liquid turns into a gas without boiling?

solution;

Boiling point is the temperature at which liquid is transformed into vapor when heat is applied. It is the temperature at which an element or substance starts to boil. The boiling point of water is 100 °C or 212 °F.  

This process is known as vaporization at higher altitudes the temperature of the boiling point is lower.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.