Question:
Mercury boils at $367^{\circ}C$. However, mercury thermometers are made such that they can measure temperature upto $500^{\circ}C$. This is done by
Mercury boils at $367^{\circ}C$. However, mercury thermometers are made such that they can measure temperature upto $500^{\circ}C$. This is done by
Updated On: Jul 5, 2022
- maintaining vacuum above mercury column in the stem of the thermometer
- filling nitrogen gas at high pressure above the mercury column
- filling oxygen gas at high pressure above the* mercury column
- filling nitrogen gas at low pressure above the mercury column
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The Correct Option is B
Solution and Explanation
Answer (b) filling nitrogen gas at high pressure above the mercury column
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Top Questions on Pressure
- The volume contraction of a solid copper cube of edge length 10 cm, when subjected to a hydraulic pressure of \( 7 \times 10^6 \) Pa, would be ________________________ mm\(^3\). (Given bulk modulus of copper = \( 1.4 \times 10^{11} \) N m\(^{-2}\))
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Concepts Used:
Pressure
Pressure is defined as the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
Everyday examples of pressure are:
- The working of the vacuum cleaner is an example of pressure. The fan inside the vacuum creates a low-pressure region which makes it easy to suck the dust particles inside the vacuum.
- Using a knife for cutting is another example of pressure. The area exposed from the knife is small but the pressure is high enough to cut the vegetables and fruits.
Formula:
When a force of ‘F’ Newton is applied perpendicularly to a surface area ‘A’, then the pressure exerted on the surface by the force is equal to the ratio of F to A. The formula for pressure (P) is:
P = F / A
Units of Pressure:
The SI unit of pressure is the pascal (Pa)
A pascal can be defined as a force of one newton applied over a surface area of a one-meter square.