- CONDUCTION: Is when heat is transferred from one molecule to another though a substance, in other words it's the flow of heat through solids. An example of this would be when one end of a nail is under a flame over a period of time till the other side of the nail will be hot as well. This is because of conduction.
The time it takes for the other side of the nail to become hot depends if it's the material is a heat conductor or insulator. If it's a conductor then heat can easily be transfer, but if it's a insulator heat is difficult to be transmitted.
- CONVECTION: Is the transfer of heat by a movement of liquid and gas due to different density levels which is caused by the difference in temperature. An example of this would be when a kettle is being heated up by a stove. The bottom of the kettle is heated first then the heat rises to the top and the cooler water flows down to be heated. This continues to circulate making the heat in the kettle transfer throughout the liquid.
- THERMAL RADIATION: Is electromagnetic radiation created by thermal motion. Radiation is something that emits energy through waves, electromagnetic radiation is just a type of wave that sustains electric and magnetic components. Hence thermal motion produces energy in the form of waves that maintain electric and magnetic substances.
Tuesday, 7 May 2013
WHAT IS THE PURPOSE OF A THERMOS?
The purpose of a thermos is to retain the temperature in a container by allowing heat to flow out or in so that its contents are kept cold or hot depending on the liquid in the container. Heat can only flow from hot surfaces to cold ones by three ways.
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