Science

     In science we are learning about thermometers. The most common liquid used in thermometers are mercury and alcohol. The most common used thermometers are; liquid-in-glass thermometers, gas thermometers and metal thermometers. The most common out of these three is the liquid-in-glass thermometer. There are four parts to the thermometer they are: the bulb which is the bottom of the thermometer, the stem which is the outer part of glass that is surrounding the bore and there is a scale which are the lines on the thermometer which tell you the temperature of the substance you want to know the temperature of. This has to do with expansion and contraction. 

 

When you are taking the temperature of  a substance if its temperature is high the particles in the liquid expand and they have no where to go, but up. This is how you figure out the substances temperature because the liquid will eventually stop moving and you will be able to see the temperature of the substance on the scale.  The same goes for when a substance is cool. The liquid contracts and goes down the thermometer instead of up.

By: Alycia