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Simply put, thermometers measure changes in temperature. Bulb thermometers operate on a basis that liquid changes its volume relative to its temperature; other thermometers tell you the temperature in the furnace, how high your fever is or room temperature.
okay well, my teacher says that we have to find out what a thermometer measures and all ice got from sites where it measures the changes in temperature...This is so far the best site ive found bcuz its straight forward and looks pretty :]