Question

) Why doctors prefer thermometers filled with mercury over thermometers filled with other liquids? f)

Answer 1

Explanation:

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

1. Mercury is the only element which has a large value of coeffcient of expansion.

2. When it is used in the thermometer, a very little change in the temperature can be found out.

3. It has the capability to measure temperatures that are high.

4. It does not get sticked to the surface of the thermometer which is made of glass.

Water cannot be used in thermometers because -

1. Water cannot measure the temperature which is below 0 celsius and which is more than 100 celsius.

2. We will not be able to identify water if used in the thermometers because the former one is transparent.

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Answer 2

Doctors prefer thermometers filled with mercury over thermometers filled with other liquids because of the following reasons:

• Coefficient of real expansion of mercury is high and uniform.
• It remains in liquid state for a long range of temperature.
• Mercury has low specific heat.
• Mercury does not wet the walls of the capillary, which helps us to get more accurate reading.
• Mercury is a shining liquid and it can be obtained in pure form, which makes it easier to see.
• Thermal conductivity of mercury is low and its vapour pressure is also low.

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Additional Information

Thermometer-

The thermometer is an instrument used for measuring temperature. The word thermometer is made up of the two words, thermo means heat and meter means to measure.

Thermometer usually have a liquid that expands when heated and contracts when cooled. Mercury is the most commonly used liquid and the mercury-in-glass type thermometer is the most common type of thermometer. Most thermometers are adjusted with the Fahrenheit or Celsius scale to measure temperature.

Galileo Galilei's Thermometer-

Galileo Galilei's thermometer is one of the earliest known thermometers. The thermometer had a water-filled glass bulb. The water moved up and down the bulb as the temperature changed. Galileo called his thermometer as 'thermoscope'.