Look at figure. Mark where the heat is being transferred by conduction, by convection and by radiation.

The heat flows from a body at a higher temperature to a body at a lower temperature. There are three ways in which heat can flow from one object to another. These are conduction, convection and radiation.

a) Conduction is a process in which heat is transferred from the hotter end to the colder end of an object by direct contact.

b) Convection is a process in which heat is transferred due to the actual movement of a heated fluid (liquid or gas).

c) Radiation is the process by which heat is transferred from one object or place to another, with or without the use of a medium. Here, there is no physical contact between objects or places.

Here,

1) Transfer of heat from hot plate to pan is by conduction.

2) Transfer of heat within water is by convection.

3) Transfer of heat from hot bodies like pan, plate, burner etc. to the surroundings is radiation.