What Does a Thermometer Look like?


A thermometer such as a bulb thermometer contains a type of a liquid known as mercury. Such a thermometer works with the simple principle that a liquid changes its volume relative to its temperature. It also uses a fairly large bulb and a narrow tube to accentuate the change in volume.
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A thermometer basically looks like a glass pencil with a ball at the end. Although current thermometers are all digital, and often have tiny computer screens on them to display the temperature. You can find more information here: http://mydailycolumn.files.wordpress.com/2009/07/graphics-mdc-mercury-thermometer.jpg
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