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Terms in this set (68)

Conduction- is the transfer of energy from a hotter object to a cooler object (when the objects are touching)
For example, a spoon in a cup of hot soup becomes warmer because the heat from the soup is conducted along the spoon.
Conduction is most effective in solids-but it can happen in fluids.
Fun fact: Have you ever noticed that metals tend to feel cold? Believe it or not, they are not colder! They only feel colder because they conduct heat away from your hand. You perceive the heat that is leaving your hand as cold.

Convection- is the transfer of heat by the actual movement of the warmed matter.
Heat leaves the coffee cup as the currents of steam and air rise.
Convection is the transfer of heat energy in a gas or liquid by movement of currents. (It can also happen is some solids, like sand.) The heat moves with the fluid.
convection is responsible for making pasta rise and fall in a pot of heated water. The warmer portions of the water are less dense and therefore, they rise. Meanwhile, the cooler portions of the water fall because they are denser.
An example of convection is standing in front of a fan on a hot day.

Radiation- Electromagnetic waves that directly transport ENERGY through space.
Sunlight is a form of radiation that is radiated through space to our planet without the aid of fluids or solids
60% of heat from the body is lost via radiation
You can gain heat via radiation if the object or person is at a higher temperature than your skin

Evaporation- is the change in state of a liquid to a gas (vapour)
Makes use of the principles of conduction, convection and radiation.
The evaporation of water requires heat which is provided by the body
Even if a person is not sweating, water still evaporates from the skin

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