Why Mercury Is Used in Thermometer Instead of Water

So by using Mercury in thermometers we can measure the temperature ranging from -388 degree Celsius to 357 degree Celsius. Also the boiling point of Mercury is somewhere around 356 C.

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Mercury is used in thermometers because of the given reasons below.

. Mercury is the only one in a liquid state at room temperature. Mercury is the only element which has a large value of coeffcient of expansion. Water cannot be used in thermometer because of its higher freezing point and lower boiling point than other liquids.

Water cannot be used as a thermometric liquid because it is not helpful to measure below 0C and above 100C. It expands uniformly when heated. However nowadays mercury is usually banned because of its health hazards.

So alcohol which freezes at temperature below the point where water freezes was used. Cf water at 1000 kgm3 so atmospheric pressure can be balanced by a column of liquid mercury only 760 mm high whereas you would need 103 m of water. I has a high boiling point 357 C and a low freezing point -39 C.

It has a wide temperature range. Mercury is used in Thermometer because. This range is very negligible as compared to other liquids like mercury which has a freezing point of about 39 C and boiling point 356 C.

Mercury also has a high coefficient of expansion but it is not too high. We use mercury in thermometers as they remain in liquid form even with a change of temperature in it. It provides precise measurements.

Water does not expand due to. It is a good conductor of heat. Why is mercury used in thermometers instead of water.

A small change in the temperature causes change in volume of a liquid. Hence the slightest change in temperature is notable when its used in a thermometer. It also has a low vapor pressure and works on all wide range of temperatures down to -39 C or -38 F.

This means you can subject the mercury in a thermometer to heat and it will react. It also has a high boiling point which makes it very suitable to measure higher temperatures. Waters maximum density occurs at 39Â F 4Â C.

This range is very small as compared to other liquids as mercury having freezing point about 39 oC and boiling point 356 oC. Alcohol has low melting point and thus is used to measure temperatures below 0 degree celsius. Most often thermometers use mercury but alcohol could be used as well since it has a very low freezing point -114C.

Water would be even cheaper but not too good for measuring. It has the capability to measure temperatures that are high. It is a good conductor of heat.

The reasons for using mercury as a thermometric liquid are the following. Mercury was used in thermometers primarily because of its liquid temperature range its constant coefficient of thermal expansion and its high thermal conductivity. Mercury has a freezing point of -388 C.

Water cannot be used as a thermometric liquid because it is not helpful to measure below 0C and above 100C. Why is water not use instead of mercury thermometer when it is easily available to us. Because of alcohols high coefficient of expansion mercury was chosen as a better candidate for filling thermometers.

The main reason why mercury used is because of its quite dense 13600 kgm3. It has low specific heat capacity. We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.

Add answer 7 pts. Mercury increase its temperature fastly and water do but it takes too much time so because of that mercury is used instead of water Upvote Reply Answer this doubt In thermometer mercury expands due to the heat. Mercury is a good conductor of heat.

Therefore the correct answer is option A. It is used in thermometers because it has a high coefficient of expansion which makes it easy to move in the thermometers as per the temperatures. Various liquids could be used in thermometers including water.

Mercury is the only metal that is in liquid state at room temperature. Mercury has high density and low length is essential for pressure measuring. Why do people use alcohol in thermometers instead of water.

It has a low freezing point of -39 degrees Celsius. Well for one reason alcohol is much cheaper than mercury. Early thermometers used water but because water freezes there was no way to measure temperatures less than the freezing point of water.

Mercury is the only one in liquid state at room temperature. So if we use Mercury in thermometers then we can easily measure up to -388 C. If water is used in a thermometer it will start phase variation at 0 C and 100 C.

Its stage indicates the temperature as rapidly as potential and perfectly. Best answer 1. Outline Why Mercury is a Great Thermometer Filling Why Mercury is No Longer Used in Thermometers.

Mercurys is about six times less that of alcohol. Its high density helps to make small manometers. If water is used in a thermometer it will start phase change at 0 oC and 100 oC and will not measure temperature out of this range.

Share with your friends. It has a very high boiling point of 357 degrees Celsius. Instead of water why is mercury used in thermometer.

A water thermometer wouldnt be too useful for temperatures below 32Â F zeroÂ C. Mercury remains liquid down to -78Â F -61Â C. This will not help in measuring temperature beyond this range.

When it is used in the thermometer a very little change in the temperature can be found out. Mercury is used in thermometers because it has high melting and boiling points and thus it could be used to measure a wide range of temperatures. It will not enlarge when it solidifies therefore it doesnt fracture the glass tube of the.

A small change in the temperature causes change in volume of a liquid. Subsequently question is why mercury is used in manometer instead of water. Mercury has a boiling point which makes it.

It is used in thermometers because it has a high coefficient of expansion. Its used in thermometers because it has high coefficient of expansion.

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