why water is not use in liquid-in-glass thermometer?

Answer 1

B Coz water boils at 100 C and converted into vapours on more heating we ll see that temp will not increase after 100 bcoz its the highest temp of water and it is constant.
But when we use thermometer for mesuring amount of heat in body or of a body that temp may goes higher than 100 C, if we use water as thermal indicator it will not shoe temp more than 100 C so we donot use water in thermometer. We use mercury as heat indicator due to its high boiling point or high constant temperature.

Hope clear now.

Answer 2

Two main reasons that I can think of:

1. Water is solid below 32 F, so you couldn't measure temperatures below 32 F. Mercury and some types of alcohol remain liquid well below water's freezing point. Also, water expands when it freezes, which could crack the glass.

2. For temperatures between 32 and 39 F, water shrinks as it is heated. For a thermometer to work properly, the liquid must expand while heated for the entire temperature range of the thermometer.

Answer 3

Firstly, water tends to stick to the side of the glass, because of high cohesive forces.

So there would be droplets in the thermometer which is not desired.

Water has a temperature range of just 100 Kevins for staying as a liquid and this is not good for thermometers if you want to measure temperatures above 100 degrees celsius or below 0 degrees celsius.

Answer 4

water dosent change that much in size when exposed to different
temperatures when compared to something like mercury. water would work but it would take a great chane in temp to make a small change in the readout. if you used water in an oral thermometer, the lines would be too close together to be usefull.

Answer 5

To use water you would need a very long tube. The density of water is such that under normal atmospheric pressures you would need a tube over 30 feet long to register pressure fluctuations; however, the very high relative density of mercury makes it possible to do the same thing with very short tubes.

Answer 6

do you think the water in liquid-in-glass thermometer will go to below zero if you put it in the freezer???????

Answer 7

Mercury calibrated is for the lines. Water not rise like mercury (or other toxic-non chemical). Water boil at heat.

Answer 8

the thermal expansion coefficiant of water is very high, its expands very less than alcohol for given temerature change.

therefore alcohol is preffered for better visible change

Answer 9

Water expands when it cools near freezing. the expansion is not linear.

Answer 10

bcoz
water is transparent medium ,it also sticks to glass in thermometer.even water is not found in pure form.