What is boiling point

Boiling point :

The temperature at which the liquid boils and turns to vapour is called the boiling point.

In other word, the boiling point of a substance is the temperature at which the vapour pressure of the liquid equals the pressure surrounding the liquid.

When a liquid is heated, it eventually reaches a temperature at which the vapour pressure is large enough that bubbles form inside the body of the liquid. This temperature is called the boiling point.

The boiling point of a liquid varies depending upon the surrounding environmental pressure.

For any liquid boiling point is high in high pressure than its atmospheric pressure.

For a given pressure, different liquids boil at different temperatures. 

For example, water boils at 100 °C (212 °F) at sea level, but at 93.4 °C (200.1 °F) at 2,000 meters (6,600 ft) altitude.