Barometer

It is a very simple, effective and helpful tool as it is easy to make and too a very cool project far any science fare. it tells us about the air pressure outside.

As it is a simple project and therefore needs very little time to make it.

So , the things you require are:

• An empty jar
• A balloon
• A straw

To make it follow the steps below:

• Take a balloon and blow it so that it gets stretched
• Now cut the balloon in half and throw away the neck piece
• Now take the empty jar and place the half cut balloon on the top of the jar and see that there are no wrinkles on the balloon  
• Now take the straw and place it on the balloon with the help of tape as shown in the image

 Observation

When the outside temperature decreases, the air pressure outside is more as compared to the air pressure inside the barometer as we know the movement of air is from high pressure to low pressure, as a result the air outside compresses the jar and the balloon blows up and the straw goes up indicating the air pressure and vice versa

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