You will need:
q A small transparent
bottle
q Food colour
q Water (normal
temperature)
q Bowl of hot water
q Bowl of cold water
q Straw
q Clay
q Index card and pencil
Try this fun experiment to make your very own thermometer at home. Understand how water molecules expand and contract with a change in temperature.
INSTRUCTIONS
- Take a small transparent bottle and add a few drops of food colour to it. Add normal room temperature water to this and fill it till the top.
- Place a straw into the bottle and seal it in the centre of the bottle, with moulding or regular clay.
- Place the bottle carefully in the bowl of hot water. Wait for a few minutes.
- Next, remove it and place the bottle in the bowl of cold water.
RESULT
When you place the bottle in the hot water, the
water molecules expand. Since they have no
place to go, they expand upwards into the straw. Thus, showing the water level at which the water is heated mark the spot as H. Similarly, when placed in the cold water, the water molecules in the bottle contract and the water which has risen into the straw now starts to fall. Mark this spot as C. Use your thermometer to record the temperature around you.
