When raw vegetables are immersed in boiling water, vegetables start to get cooked.
The boiling point is the temperature at which the vapor pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.
Stewing: It is a cooking method. It uses small, uniform pieces of raw food immersed in a liquid and slowly simmered. It involves a very slow boiling of water.
Simmering: It is a cooking method in which foods are cooked in hot liquids kept just below the boiling point of water.