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 ______.
The common laboratory thermometer is a ______ thermometer
All clinical thermometers have a ______ that prevents mercury from flowing back into the bulb.
Digital thermometers are mainly used to take body temperature.
Mention the use of laboratory thermometers.
We are advised to avoid keeping the clinical thermometer in the sun or near a flame. Why?
Explains the properties of mercury.
Explain how do you determine the temperature of hot water using a laboratory thermometer?
write a note on a digital thermometer.
Boojho has three thermometers as shown in the following figure. He wants to measure the temperature of his body and that of boiling water. Which thermometer (s) should he choose?
