Answer:
When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer. When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together.
Explanation:
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An increase in temperature indicates the molecules in the liquid are moving faster and the temperature is rising in the thermometer.
Mercury thermometer are useful in measuring body , liquid and vapor temperature.
Mercury is used in the thermometer , The movement of the liquid in a thermometer shows changes in temperature.
The volume expansion coefficient of Mercury is very high and so by 1 degree rise in temperature there is 0.018 % increase in volume.
An increase in temperature indicates the molecules in the liquid are moving faster and the temperature is rising in the thermometer.
To know more about Mercury Thermometer
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