1. Convection
3.3 (a) how temperatures differences lead to the transfer of energy thermally by
convection.
(d) Convection in liquid and gases in terms of molecular behaviour and
variation in volume and density.

2. Tea Bag experiment What do you observe? Explain why it happens.
Key Language
Smoke dense more
Less air particles
further apart

3. Smoke Chimney Sketch the path of the smoke? Why? Key Language
Smoke dense more
Less air particles
Closer further
Together apart

4. Practical Fill the beaker to ¾ full of water.
Use forceps to pick up a single crystal of potassium permanganate and drop it
carefully through the glass tube to one side of the bottom of the beaker.
Place your finger on the top of the tube and remove carefully.
Light the Bunsen burner well away from the apparatus. Use the gas tap to get the
smallest blue flame that you can
Put the small Bunsen flame directly underneath the crystal and record your observations.

5. H E A T Analysis This cycle is called a convection current.
Key Language
Smoke dense more
Less water particles potassium permangnate
Closer further
Together apart
H E A T

6. Plenary How does loft insulation lower heat loss from convection.
How does a draught excluder lower heat loss from convection.