Question 87
The greenhouse effect
You will need:
- three large plastic bottles, such as 2-litre drinks bottles with lids, with a hole in each lid
- three thermometers
- a means of fixing the thermometers in place, such as modelling clay
- carbon dioxide supply
Method
1 Place a thermometer in each of the bottles so that the bulb does not touch the bottle in any way.
2 Add some carbon dioxide to one bottle.
3 Add about 5 cm³ of water to another bottle.
4 Leave the third bottle with normal air.
5 Label the bottles.
6 Place the bottles alongside one another outside. If this is not possible, you can leave them in the classroom near the window.
7 Take the temperatures in each bottle at the start.
8 Record the temperatures in the three bottles over the next few days. It is up to you to decide when and how often.
Why did you have one bottle with normal air in it?
You will need:
- three large plastic bottles, such as 2-litre drinks bottles with lids, with a hole in each lid
- three thermometers
- a means of fixing the thermometers in place, such as modelling clay
- carbon dioxide supply
Method
1 Place a thermometer in each of the bottles so that the bulb does not touch the bottle in any way.
2 Add some carbon dioxide to one bottle.
3 Add about 5 cm³ of water to another bottle.
4 Leave the third bottle with normal air.
5 Label the bottles.
6 Place the bottles alongside one another outside. If this is not possible, you can leave them in the classroom near the window.
7 Take the temperatures in each bottle at the start.
8 Record the temperatures in the three bottles over the next few days. It is up to you to decide when and how often.
Why did you have one bottle with normal air in it?
