Question

In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?

Answer 1

Mercury is an excellent thermometric liquid

1. When heated, it expands evenly.
2. Its specific heat capacity is poor.
3. It has a high boiling point of 357 degrees Celsius and a low freezing temperature of -39 degrees Celsius.
4. It is a good heat conductor.
5. It does not adhere to the glass tube's walls.
6. It is opaque and gleaming, making it easily visible.
7. It can be purchased in its purest form.

Mercury thermometer

1. Because mercury is the only metal that is liquid at room temperature, mercury thermometers are employed in measuring.
2. We also know that Mercury has a high coefficient of expansion, which means it can detect even minor temperature changes.
3. Mercury has a gleaming, colorless texture that is plainly visible to the naked eye.
4. Mercury does not adhere to the glass surface, which allows it to slide over and display temperature changes.

Hence, mercury expands when heated, thus when it comes into contact with a hot object, it's level in the capillary rises.