Why is mercury thermometer preferred over alcohol thermometer ??
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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
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
Answered by
32
Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.
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