Question 83
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.
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.
