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Minimum thermometer

A minimum thermometer measures the lowest temperature during a given period of time. It is a liquid-in-glass thermometer that contains a barbell-shaped marker within the liquid.

As the air temperature drops, the liquid and marker move down the thermometer tube. At minimum temperature, the liquid and the marker stop moving; as the temperature starts to rise, the liquid moves back up the tube, but the marker remains stationary. Thus the level of the marker represents the minimum temperature.

The minimum thermometer must be held horizontally in order to work properly. To reset it, the thermometer is simply tipped upside down. Scientists who study the weather use this special thermometer to measure daily minimum temperatures.



Maximum thermometers

A minimum thermometer measures the lowest temperature during a given period of time. It is a liquid-in-glass thermometer that contains a barbell-shaped marker within the liquid.

As the air temperature drops, the liquid and marker move down the thermometer tube. At minimum temperature, the liquid and the marker stop moving; as the temperature starts to rise, the liquid moves back up the tube, but the marker remains stationary. Thus the level of the marker represents the minimum temperature.

The minimum thermometer must be held horizontally in order to work properly. To reset it, the thermometer is simply tipped upside down. Meteorologists use this special thermometer to measure daily minimum temperatures.




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