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Yes, above the mercury or the other liquid.
the heat makes it expand you see
The sensor is just the mercury, a liquid metal.
The red liquid in a thermometer is Mercury, which is usually encased in a glass tube
A Galileo thermometer is a thermometer made of a sealed glass cylinder containing a clear liquid and a series of objects whose densities are such that they rise or fall as the temperature changes.
a bulb with a thin glass wall
what do they use for the liquid in glass ball thermometer
A liquid in glass thermometer is sensitive to small changes in temperature due to the thermal expansion of the liquid contained inside the glass tube. As the temperature increases, the liquid expands, causing it to rise up the calibrated scale of the thermometer. Conversely, as the temperature decreases, the liquid contracts, causing it to subside on the scale. This expansion and contraction of the liquid is highly responsive to even slight temperature variations, making it sensitive to small changes in temperature.
thermometer
A so-called "glass" thermometer has a small bore-hole in the center of the glass that has some liquid in it. It's the activity of the liquid in the narrow hole that makes the thermometer a thermometer.
thermometer
A thermometer can be used to measure the temperature of a liquid. There are digital devices that don't need to come into contact to register the temperature.
For a classic thermometer: glass and mercury, colored ethanol or another liquid.
Celsius, Fahrenheit, and Kelvin.
We cannot use other liquids in thermometer since it may not have a wide range of temperature for remaining in the liquid state. It may stick to the glass of the thermometer. It may be transparent. The liquid may not be sensitive to thermal expansion and may not have a uniform expansion with heat. The liquid may not be a good conductor of heat.The liquid may not be found in pure form. Hence mercury is the best liquid as a thermometric liquid.
the heat makes it expand you see
As the liquid in the thermometer is heated it expands, and the only way the expanding liquid can go is upward. As the liquid in the thermometer cools, it will contract, and the liquid will fall back down into the resevoir, causing the column of liquid to move downward.