Water is taken in a flask and is heated from the bottom. By which process water gets heated in this experiment?

When water is taken in a flask and is heated from the bottom then, by the process of convection, water gets heated in this experiment. When it is heated, the water near the flame becomes hot and this hot water rises up at the surface of the flask. The cold water from the sides moves down towards the source of heat and becomes hot and starts rising up. This process continues till the whole water gets heated. Thus, the heat is transferred to the entire volume of water through the movement of water molecules. This process of the hotter fluid moving and transferring heat to the colder surroundings is called convection.