lesson 5

Question 1

Explain convection

Answer 1

When molecules of gases or liquids (fluids) hit a warmer surface they gain energy by conduction and leave the surface with more energy than they arrive with
When molecules are heated they move more quickly and occupy more space
hotter fluids are there for less dense than colder fluids
hotter fluids rise up to float on top of fluids

Question 2

What is a convection current

Answer 2

A convection current is the path taken by Rising hot fluids and sinking cold fluids

Question 3

Convection scaffold

Answer 3

air is warmed by (heat source)
this causes the air to become less dense
so it floats above the cooler air
As it spreads around it loses energy and cools becoming more dense so it stinks back down
Cold air moves towards the (heat source)

Question 4

What is the difference between convection and conduction

Answer 4

If you see a question where there is a closed system for example a room full of air a tank full of water it is probably a convection question and convection only occurs in liquids and gases
Whereas if you see a question where the energy transfer is through solids or going from one substance to another it is probably a conduction question