Why do we use both Mercury & Alcohol in a SIX MAXIMUM AND MINIMUM THERMOMETER

Asked by  | 22nd Apr, 2008, 10:57: AM

Expert Answer:

SIX MAXIMUM AND MINIMUM THERMOMETERIconsists of a U-shaped capillary tube with two separate temperature readings, one for the maximum temperature and one for the minimum temperature. There are bulbs at the top of each arm of the U-shaped tube. The one at the top of the minimum reading scale contains alcohol, the other contains a vacuum or low pressure alcohol vapour.

In the bend of the U is a section of mercury which is pushed around the tube by the expansion and contraction of the alcohol in the first bulb. It is the alcohol which measures the temperature, the mercury indicates the temperature reading on both scales.

Answered by  | 21st Jun, 2008, 06:39: PM

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