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why water is not used in thermometers instead of mercury?
Jan 21, 2014
Why water cannot be used in thermometer instead of mercury? Why mercury is preferred than water in thermometer.
to answer this question.
Sep 16, 2015
Why are we using Mercury in thermometer
, reasons are followed:
The melting point of water is 0
c but when you see mercury freezing point (melting point) -38.83
c and the boiling point of the mercury is 356.73
c. The boiling point of water is 100
c. So based on this criteria the mercury is having the temperature reading capacity compared to water.
The color of mercury is silvery which is easy to identify and where as water is transparent and there is a chance of reflections of various colors.
The thermal expansion of mercury is 60.4 µm/(m·K) (at 25 °C). The thermal expansion of water is from
C to 100
C - 4.2x10
the volumetric temperature expansion is non-linear respective to the temperature. But the mercury is linear temperature expansion can be observed. This is one of the main reasons to use of mercury in thermometers.
Water having the property of condensation but the mercury has no condensation property which is helpful to expect the exact values compared to water.
We can measure the negative and positive temperature by using the mercury but water cannot. Water is not helpful to measure below 0
C and above 100
The most metals are solids at room temperature but the mercury is liquid form because it has high coefficient of expansion.
The mercury does not stick to capillary wall of thermometer and which can easily measure temperature accurately.
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