How to Make a Simple Weather Barometer

Step-by-Step Guide

1. 1

   Step 1: Gather the things you'll need.

   These consist of:
   Scissors, tape, a balloon, a jar, an elastic rubber band, a straw.
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   Step 2: Blow up the balloon carefully and then let the air out of it again.

   (This is to stretch it.) , Discard the piece with the neck on it. , Keep it stretched firmly across and seal it down with the rubber band, around the rim of the glass jar.
   
   To make an airtight seal, avoid gaps between the balloon and the glass. , The straw is your indicator "needle".
   
   Trim the straw if it's too long, but leave more length off the jar as what is attached to it. ,, Arrange the paper so there is room above and below the straw for you to make more marks when the straw moves. , Add notes that tell you what the weather is like (for example, "rainy," "windy," or "sunny,") next to the mark.
   
   Examine the paper after several days.
   
   Check the markings and the weather statements you've put next to them.
   
   What do you notice? Can you tell if and when the weather is about to change? See the "Tips" for the answers.
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   Step 3: Cut the balloon in half.

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   Step 4: Take the remaining piece of the balloon and stretch it across the glass or jar.

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   Step 5: Tape the straw onto the balloon lid; the straw should be sitting one quarter of a way on the lid

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   Step 6: with the tape about 2 cm or 1 inch from the edge of the straw end that is sitting on the balloon lid.

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   Step 7: Put the finished glass jar next to a wall and tape a piece of paper or card to the wall behind it.

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   Step 8: Mark the current position of the straw on the paper

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   Step 9: and mark one above and below the mark

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    Step 10: about the same length away

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    Step 11: and label the high and low pressure.

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    Step 12: Check the straw regularly and keep marking its location on the paper for a few days.

Detailed Guide

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