MCQ
Q.
Which substance is used in Thermometer?
Correct Answer: A
The correct answer is Mercury.
Key Points
- Mercury is used in thermometers because it remains in liquid form throughout a wide range of temperatures i.e -37.89 degrees Fahrenheit to 674.06 degrees Fahrenheit.
- The mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam.
- Mercury has a greater coefficient of thermal expansion than alcohol.
- A thermometer with alcohol is used to measure low temperature because its freezing point is low i.e -1170C.
- It is Impossible to measure high temperatures because it’s a low boiling point.
- The thermometer with mercury cannot be used to measure the very low temperature because its freezing point is high i.e -400C.
- Mercury is the only one in liquid state at room temperature.
- It's used in thermometers because it has a high coefficient of expansion.
- It also has a high boiling point which makes it very suitable to measure higher temperatures.
- It has a shiny appearance and doesn't stick to the glass surface of the glass.
