Advertisements
Advertisements
Question
Why do we use Mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?
Advertisements
Solution
- We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.
- A small change in the temperature causes change in volume of a liquid.
- Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C.
- Water is transparent. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube.
- Due to this constraints it is not used as a thermometric liquid.
APPEARS IN
RELATED QUESTIONS
Mercury is often used in laboratory thermometers because it ______.
A clinical thermometer is not used to measure the temperature of air, why?
Digital thermometer is widely used for the measurement of the temperature due to ______.
Digital thermometers do not use ______.
Mercury is a poor conductor of heat.
Explains the properties of mercury.
Explain how do you determine the temperature of hot water using a laboratory thermometer?
A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in the following figure.
Which of the thermometers, A or B, will show a greater rise in temperature? Give reason for your answer.
How does a clinical thermometer differ from the thermometer used in the laboratory?
A solid metallic cube having a total surface area of 24 m2 is uniformly heated. If its temperature is increased by 10°C, calculate the increase in the volume of the cube.
(Given: α = 5.0 × 10-4°C-1)
