Ngā Whāinga Ako ^🔗

• To be able to explain the function of a wick

What do you think a wick is for? ^🔗

Whakakite: Walking Water ^🔗

Capillary Action ^🔗

• Liquids can flow into narrow spaces, even against the direction of gravity.
• E.g. paper in water, paint brushes sucking up water, a thin tube in water.
• The surface tension and adhesive forces between the liquid and container propel the water into the narrow space.

• Pātai: Why is capillary action important?
• Whakatika: Because it increases the surface area of the liquid. This allows it to evaporate more easily!
• Fuels need to be gaseous and mixed with oxygen to combust.

Wick Whakamātau ^🔗

1. Safety
2. Whakamātau read through
3. Check understanding each step
4. Explain must do Qs 1,2,3 during whakamātau
5. Timeframe (20mins)
6. Clean up check

Discussion Points ^🔗

1. Why didn’t the solid paraffin wax ignite?
2. Did the liquid wax ignite? Why/ why not?
3. How does the wick allow the wax to burn? (think about last lesson’s whakamātau)
4. Why doesn’t the wick burn? (clue: evaporation and sweating)