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Outcomes:
> Analyse data from an experiment into insulating a container of hot water.
> draw a bar chart.
> explain how to make a fair test.
> draw a conclusion from a set of results.
Activity:
We are going to investigate how quickly an aluminium drinks can containing hot water will cool down if placed outside for 5 minutes.
We will:
- measure 200 cm3 of hot water into each drinks can (SAFETY - let the teacher pour the water and only handle the can using gloves).
- take the temperature if the hot water using a thermometer and record it in a results table.
- place the can outside for 5 minutes, then collect it and record the new temperature of the water.
- Calculate the change in temperature and post our results in a class spreadsheet.
Activity: Keeping warm
Sally says that wearing a thicker fleece jacket will keep her
warmer. She has carried out an investigation to find out if
she is right. She didn’t have different thicknesses of fleece, so
she used more layers of fleece to represent thicker material.
She put layers of fleece around four beakers, and poured
hot water into all of them. She measured the temperature of
the water in each beaker at the beginning, and again after
5 minutes. The table shows her results.
1 Work out the temperature difference for each beaker, and write it in a copy of the table.
2 Draw a bar chart to show Sally’s results. Use axes like these:
3 Write down two things that Sally needed to keep the same to make her test fair.
4 Write a conclusion for Sally’s investigation.
5 This drawing shows a magnified view of fleece fabric.
Why do you think fleece is a good insulator?
Next Lesson: 14. Investigating insulation
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