11-10-2012, 05:43 PM
Understanding Heat Transfer, Conduction, Convection and Radiation
HT RNREDDY.ppt (Size: 972 KB / Downloads: 52)
Heat Transfer
Heat always moves from a warmer place to a cooler place.
Hot objects in a cooler room will cool to room temperature.
Cold objects in a warmer room will heat up to room temperature.
Question
If a cup of coffee and a red popsickle were left on the table in this room what would happen to them? Why?
The cup of coffee will cool until it reaches room temperature. The popsickle will melt and then the liquid will warm to room temperature.
Metals are different
When the metal is heated, this ‘sea of electrons’ gain k_____ energy and transfer it throughout the metal.
Insulators, such as w___ and p____, do not have this ‘sea of electrons’ which is why they do not conduct heat as well as metals.
The third method of heat transfer
There are no particles between the Sun and the Earth so it CANNOT travel by conduction or by convection.