Why water is not used in thermometers instead of mercury
Asked by admin @ in Physics viewed by 277 People
Why is water not used instead of mercury thermometer when it is easily available to us
Answered by admin @
· The melting point of water is 0oc but mercury freezing point (melting point) -38.83oc, the boiling point of the mercury is 356.73oc. The water boiling point is 100oc. so based on this criteria the merucury having the temperature reading capacity compared to water.
· The colour of mercury is silvery so can identify easily
· The thermal expansion of mercury is 60.4 µm/(m·K) (at 25 °C). The thermal expansion of water is from 4 oC to 100 oC - 4.2x10-2 the volumetric temperature expiation is non-linear respective to the temperature. But the mercury is linear temperature expantion can observe. This is main reason to use of mercury in the thermometers.
· The water having the property of condensation but the mercury have no condensation property so the mercury will give exact values compared to water.
· We can measure the negative and positive temperature by using the mercury but we can’t measure with water. Below 0oC and above 100oC can’t measure by using the water.
· 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 sticking to capillary wall of thermometer can easily measure temperature accurately.
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