IG Phy – Transfer of Thermal Energy (III)

A vacuum flask reduces heat transfer by conduction, convection, and radiation.

The shiny outer surface of the inner wall of a vacuum flask reflects most of the infrared radiation falling on it.

Conduction is almost entirely eliminated in a vacuum flask.

Convection currents form between the inner and outer walls of a vacuum flask.

Most kitchen pans are made of metal because metal is an excellent conductor of thermal energy.

The pan handles of metal kitchen pans are typically made of metal because they are good thermal conductors.

Car radiators use fins to increase the surface area, which helps to increase the rate of thermal energy removal.

Fire burns wood or coal mainly by transferring thermal energy through convection.

When the contents of a vacuum flask are hot, radiation is greatly reduced because the inner walls are coated with aluminum.

If an object emits more energy than it absorbs, its temperature will go up.