Conduction

Insulators

Convection

Thermometer

Heat

...is the way that heat is transferred in a solid. Some solids are better than others, metals are the best.

...are poor conductors of heat, eg paper, wood and cloth. We can use these materials to prevent heat loss.

...is the rise of hot gas over cold gas creating a current. It is the rise of hot liquid over cold liquid creating a current. Birds and gliders can use these to rise and fall easily in the air. Kettles use these to heat water.

...is used to measure temperature. The temperature tells us how hot something is.

...is a form of energy. It always flows from a hotter object to a colder object.