Answer:
1. A hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks.
2. Radiation
3. When you are making soup and the water is rising and lowering.
4. conduction
5. Conduction
6. convection
Explanation:
1. Convection is one of the three methods of heat transfer involving the transfer of heat by the rise and fall of a fluid (liquid and gas) caused by difference in temperature. Based on this, a hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks is a perfect definition of convection.
2. Another method of heat transfer called RADIATION involves the transfer of heat between surfaces without a contact between them. The sun heating the human body represents an example of radiation because there is no direct contact between the heat source (sun) and the heated surface (human body).
3. Making soup and the water is rising and lowering is an example of convection because it involves the rising and lowering of a liquid (soup) due to a temperature gradient.
4. Conduction is a method of heat transfer that involves the transfer of heat through a solid medium in direct contact with one another. The solid material is called the CONDUCTOR. The transfer of heat from a warm sand to the bare feet, acting as the conductor is an example of CONDUCTION.
5. Heat is transferred when one touches a fire. This represents CONDUCTION because the fire transfers the heat via a solid medium (hand) in contact with it.
6. The warm air near a room rises because there is transfer of heat, caused by a difference in temperature, through the fluid (gas) causing it to become more dense and rise.
