Liquid Metal Used In Thermometers

A thermometer has two important elements.

Liquid metal used in thermometers.

Silver liquid indicates that the thermometer contains mercury while red liquid is alcohol to which red coloring has been added. However it is not the thermal expansion of the liquid that is measured but rather the increase in pressure that goes hand in hand with an increase in temperature. 1 a temperature sensor e g. A thermometer is a device that measures temperature or a temperature gradient the degree of hotness or coldness of an object.

Most metals are good conductors of heat and they are solids at room temperature. Hence the slightest change in temperature is notable when it s used in a thermometer. Although uncommon in modern thermometers a clear color indicates water. And 2 some means of converting this.

It is also cheap to acquire and very accurate at measuring high temperatures. Mercury is the only one in liquid state at room temperature. Mercury can be used in thermometers. Lastly you do not need an external power source like a battery or electricity to run a mercury thermometer.

It is the only metal that is liquid at room temperature. It s used in thermometers because it has high coefficient of expansion. The bulb of a mercury in glass thermometer or the pyrometric sensor in an infrared thermometer in which some change occurs with a change in temperature. Function the liquid in a thermometer typically stays in a bulb at the bottom of the device.

In liquid in metal thermometers also referred to as liquid filled thermometers a liquid is used as a thermometric substance in the same way as in liquid in glass thermometers.