Not just a property of liquid but of all matter. All matter expands when heated and contracts when cooled, in thermometers the liquid, usually an alcohol, expands when heated lengthening the little line.
It expands and contracts with little temperature change. (I think, you may want to double check ;)
The liquid metal in many thermometer is mercury (Hg).
Mercury is used in clinical thermometers.
A thermometer is used to measure temperature by the movement of a substance called mercury inside a sealed tube
The alcohol or mercury in a thermometer expands or contracts very precisely according to heat or cold.
If the clinical thermometer is a mercury based thermometer, it needs to be shaken down prior to each use. This is because there is a pinch point between the mercury reservoir bulb and the capillary tube, to ensure that the mercury does not shrink back into the bulb after the temperature has been taken. The mercury has therefore to be shaken back into the bulb before another measurement can be made. One should note that in many countries use of mercury based clinical thermometers is now discouraged (because mercury is toxic) and electronic thermometers are used in stead - these do not need shaking.
Thermometric substance is the material used in the thermometer, whose property varies with temperature.
These are materials used in thermometer whoses property varies with temperature
when objects are heated or cooled, their temperatures change, along with some of their properties, these properties are known as Thermometric Properties. Examples include: when objects are heated, they expand, when they are cooled, they shrink. Another is, if an object is heated, its' gaseos pressure will increase and will decrease when object is cooled.
A mercury thermometer is used to measure temperature.
The red liquid in a liquid-in-glass thermometer is mineral spirits or ethanol alcohol mixed with red dye. A grey or silver liquid inside the thermometer is mercury. Mercury thermometers are not used anymore due to the dangers associated with mercury.
Mercury is used in thermometers. The mercury is the red substance in the thermometer that rises when you put it in your mouth.