Thermal Insulation Flashcards

All 4 cards in this deck

How does adding a lid reduce unwanted energy transfer from a container of hot water?

It stops hot vapour and warm air escaping from the surface, reducing energy transfer by evaporation and convection.

How does lagging reduce unwanted energy transfer from a container of hot water?

Lagging is a poor thermal conductor and traps air, so less energy is conducted to the surroundings.

Apart from the material used, what feature of an insulating layer reduces energy transfer?

Its thickness — thicker insulation transfers energy more slowly.

True or false? Insulating a hot object stops it transferring energy to the surroundings completely.

False. Insulation only slows the rate of energy transfer.