Heat can travel by Convection A hot fluid expands, so is less dense, so rises. Cold fluid takes its...
-
Upload
diana-butler -
Category
Documents
-
view
218 -
download
0
Transcript of Heat can travel by Convection A hot fluid expands, so is less dense, so rises. Cold fluid takes its...
Heat can travel by Convection
A hot fluid expands, so is less dense, so rises. Cold fluid takes its place. A convection current can be formed.
Heat can travel by Conduction
Hot particles vibrate more, so collide with adjacent particles. The heat energy travels from hot to cooler areas.
hot cold
Heat can travel by Conduction
Metals are good conductors of heatThey have
free electrons that can move from atom to atom carrying
thermal energy too
Heat can travel by Conduction
Gases are poor conductors of heat (insulators)
The atoms are too far apart for the vibrations to be passed easily.
Infrared radiation
Shiny objects reflect infrared radiation.
Nottingham Forest winning the champions league in 1979
The silvered inner and outer stops the heat escaping (and entering) by radiation
silvered outer
silvered inner
In reality, some heat escapes via the lid and eventually the liquid inside will become the same
temperature as the surroundings