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Wonderful Weather - Experiment 6

1. Cloud in a bottle | 2. Tornado in a Bottle | 3 Air Pressure in a Jar | 4. Air Pressure on a glass | 5. Make a barometer | 6. Make a Thermometer

Experiment: To make a thermometer

Materials:

You will need:

1 small bottle (about 500mls)
Water
Food Colouring
Straw
Bluetack
Scissors
Pencil
Piece of card


 

Method:

What you have to do: 

1) Fill your bottle half or quarter full with water.

2) Add only 2 or 3 drops of food colouring to our water so you can see it clearly during the experiment.

3) Using your scissors, poke a hole in the lid of the bottle - big enough to fit your straw.

4) To make sure that your bottle is airtight, insulate it using bluetack. Stick it around the straw at the top and stick it around the straw underneath the lid also.

5) If you do not have a lid for your bottle, just use bluetack to seal the top of the bottle around the straw.

Result: Watch and see what happens. If you really want to see what happens better, put your bottle in boiling water or really icy water.

Conclusion: If you put your bottle in hot water or if it's a hot day, the molecules in the water expand so the only way to get out is up the straw. If it's a cold condition, the molecules will contract and the water goes down the straw.