Convection radiation and conductiuon

Convection radiation and conductiuon

by Michael Uleau

​Conduction explains the process in which the transfer of heat takes place between objects by direct contact.

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Convection refers to the form of heat transfer in which energy transition occurs within the fluid.

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Radiation helps the heat to flow through empty spaces

​Conduction, energy flows through direct contact.

Multiple Choice

What is the definition of CONDUCTION?

• When heat is transferred from objects like rays of light or electromagnetically.
• a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
• When heat transfers from objects that are touching.
• When heat transfers through the heater or AC in your house.

Multiple Choice

What type of heat transfer takes place when you touch a warm mug of hot chocolate?

• Radiation

• Convection

• Conduction

• None of the above

Multiple Choice

Conduction requires

• Electricity

• the electromagnetic spectrum and particles

• air or water flow

• direct contact

​Convection: the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

Multiple Choice

When air is heated, its density ___________.

• increases

• decreases

• remains the same

Multiple Choice

The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. What happens to the density of the air as it cools, and how does it move?

• The density of air increases. It moves down.

• The density of air increases. It moves up.

• The density of air decreases. It moves down.

• The density of air increases. It moves up.