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Life During World War II Life, society, work and culture in the past: Life during World War II
3 Put some glue on the bottom quarter of the straw.
4 Stick the straw to the balloon. Ensure that the end of the straw touches the middle of the balloon and the straw lies flat with two-thirds hanging over the edge of the jar.
5 Cut out an arrow shape from the card and insert it into the end of the straw.
6 Stick a sheet of paper or card to the bottom of a wall and position the jar so that the pointer is facing the paper.
7 Mark a line on the paper where the tip of the arrow is pointing. Write the words ‘high pressure’ above the line and ‘low pressure’ below the line.
8 Place your barometer outside, next to a wall.
Stick the paper next to it at the bottom of the wall.
Check the barometer after a few minutes.
Record whether the straw is pointing to high or low pressure.
9 Bring your barometer and paper indoors after use each day.
How your barometer works ● Pointing downwards: The air inside the jar is expanding and rising. This shows that the atmospheric pressure is low. ● Pointing upwards: The air inside the jar is dense and sinking. This shows that the atmospheric pressure is high.©The Educational Company of Ireland
