11
AtmosphereandClimate
3 Put some glue on the bottom quarter of the straw.
Ire la n
d
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.
of
5 Cut out an arrow shape from the card and insert it into the end of the straw.
om pa ny
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.
na l
C
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.
uc
at io
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.
e
Ed
9 Bring your barometer and paper indoors after use each day.
Th
How your barometer works
34
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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.
SKILLS
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EWM6 Activity Book (Units 3&4).indd 34
C Investigating and experimenting; Recording and communicating
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