When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right ... at high temperatures.) This heat drives convection cells within the ...

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Convection in a liquid Convection in a liquid can be seen ...

This clip shows how a vacuum flask prevents heat loss ... Students could draw a diagram or build a model of to show how conduction, convection and radiation are prevented. They could experiment ...