write a comparative note an alcohol thermometer and mercury thermometer
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Answer:
The word thermometer comes from the word thermos meaning warm and meter meaning measuring device. Etymologically, the thermometer is a device used to measure the temperature appropiate and express it by a number.
Thermometer is commonly made of a glass tube which is filled with liquids. The liquids are used as a thermometer filler, because the liquids undergo the change in volume if the temperature changes.
Commonly, thermometers use alcohol and mercury to fill their tubes, because alcohol and mercury have superiorities compared with anothers. However, there are also the weaknesses of alcohol and mercury. Meanwhile, if we compare between mercury and alcohol thermometer, we will find the superiorities and weaknesses of alcohol and mercury. Those are as follows:
Comparison of Alcohol and Mercury Thermometer
The Superiorities or the advantages of Alcohol:
It can measure a low temperature, because its freezing point is low (-115ºC).
It can measure the temperature precisely, because it has large expansion coefficient.
Its expansion is reguler.
less hazardous.
The Weaknesses or the disadvantages of Alcohol:
It cannot measure a high temperature, because its boiling point is low.
It makes wet the wall of its place.
It is colourless so it must be given dyestuff in order to be visible.
less durable (alcohol evaporates)
The Superiorities or the advantages of Mercury:
It is visible, because its colour is silvery shinning.
its expansion is regular.
It does not make wet the wall of its place.
It can measure the temperature quickly and precisely.
The Weaknesses or the disadvantages of Mercury:
It cannot measure very low temperature, because its freezing point is high (-40ºC)
Mercury is poisonous, so it harmful if its tube is broken.
Its price is very high.
display is harder to read
cannot be used for thermograph
slow response
fragile
Answer:
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Reading a thermometer.....
For measurement purpose, the temperarture scale is calibrated to assign a
numerical value to a given temperature. Depending on the purpose, and
use, of a thermometer, two fixed reference points (lowest temperature and
highest temperature) are choosen. The difference, in the temperature of the
two fixed reference points, is called the range of the thermometer. The
interval, between these fixed points, is divided into an equal (fixed) number
of divisions.Two scales, that have been in common use, are the Fahrenheit and the
Celsius scales. Most of the countries now use the Celsius scale to measure the temperature of an object .
Diagram of the clinical thermometer is given in the figure.....
Explanation:
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