Chapter 8 - Heat Flashcards
When does the movement of thermal energy stop?
When the temperature of the two substances are the same
What direction does thermal energy flow?
It flows up
What is conduction?
The transfer of thermal energy through a substance or between substances in contact, by the collision of particles
What are examples of good conductors?
Metals
Gold (The best)
What are examples of insulators?
Glass
Rubber
Wood
How does conduction occur on Earth?
The core melts rock, and causes magma to be pushed to the surface. This causes volcanic eruptions to occur
How does heat move by convection?
When liquid is heated, is becomes less dense and is pushed upwards. It then cools and falls back down because it is more dense.
How does heat move by radiation?
The sun puts out electromagnetic waves, or rays. Radiant energy is absorbed by conductors on Earth, such as black rock, metal, solar panels
What are good absorbers of radiation?
The colour Black
Plants
Solar panels
People
What are good reflectors of radiation?
Mirrors
Glass
polished metal (Shiny)
How can we manage the transfer of thermal energy?
We use insulators such as fibreglass, and can plant a green roof the absorb thermal energy and prevent it from coming into our homes. we can also use an air-to-air heat exchangers to reduce the cost of heating.
