Answer:
Convection relates to density differences within fluids.
Radiation does not require a medium or physical contact to transfer heat.
Conduction occurs during physical contact between solid objects not in thermal equilibrium
.
Explanation:
Convection is a heat transfer process in which a moving fluid (gas or liquid) transports thermal energy between two points. A daily example is seen when the glass of the bathroom fogged when bathing with hot water. Another example is the operation of hot air balloons that can "fly" thanks to the hot air inside.
Radiation is a heat transfer process in which the heat emitted by a body due to its high temperature heats another body. There is no contact between the bodies, nor intermediate fluids that carry heat. An example is when the sun heats a car when we leave it in the parking lot. It warms so much that we can even burn our skin.
Conduction is a process of heat transfer between two points that are at different temperatures. No matter transfer occurs in this process. An example is when we have introduced a metal spoon in hot water. There will be a heat transfer by conduction from the hot end to the cold by increasing the temperature of the spoon.
