Below, the heat from the burner to the pan is an example of conduction. Also, the walls of a home that are insulated or not insulated show up in an infrared camera because of conduction.
Below, the bluish streaks below the window you see under the window is caused by convection. We also have seen convection occurring when balloons are let go at a football game and are carried aloft as a result of warm air rising.
- Heat is transferred by emission & absorption
- Both objects emit and absorb radiation
- Radiation occurs from all object above 0 degrees Kelvin (That’s really cold!!)
On the right, heat is being emitted by the coals of the grill and radiating to us and any food that would be held over them. This is also how the sun heats us and the earth.
The hard thing here is to remember that even cold things emit and absorb infrared radiation. It isn’t just only the warm stuff that we see when using the infrared camera as shown by the images taken from a freezer shown below.
P.S.- Come back next week and hear how my last day went!