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In this exercise, an activity is explained to understand how the thermometer measures the temperature.
Materials Required:
A small glass bottle, a rubber cork, an empty refill, Water, colour, candle, fork and paper
Procedure:
- Take a small glass bottle.
- Fill it with coloured water.
- Make a hole at the centre of the rubber cork.
- Pass empty refill from the hole of the rubber cork.
- Make the bottle airtight and observe the water raised in the refill.
- Make a scale on paper, place it behind the refill and note down the position of the water's surface
- Hold the bottle with a fork and supply heat to it with the candle. Then observe.
What will happen?
Initially, the bottle and liquid in the refill are at . So, the liquid from / to the bottle and starts to in the refill. This process continues until they both reach the .
Now, heating up the bottle causes an , which creates the difference in temperature between liquid and bottle. So, to attain the , the heat transfer takes place between bottle and liquid. This heat transfer enables the , which is directly related to a change in temperature. So, we can compare this in the refill with the temperature.
When you cool the bottle, the liquid due to .
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