Conduction and convection

Question 1

How does conduction work?

Answer 1

• Heats up solid
• As the temperature of a particle increases, its kinetic energy store increases and it starts vibrating more
• The particle collides with neighbouring particles more, which also increases their kinetic energy store
• Energy is passed down the objext through the particles, effectively increasing the temperature of the whole object

Question 2

How does convection work?

Answer 2

• Heats up liquids and gases
• As the particles near the heat source increase in temperature, they become less dense and rise above
• The cooler, more dense particles fall down to the heat source where they also get heated up
• Previously heated up particles now cool down and fall back, creating an endless loop

Question 3

How does radiation work (infrared to heat up)?

Answer 3

• Heats up through a vacuum
• All particles are constantly absorbing and emitting radiation
• The more radiation the object emits, the higher its temperature