Question

A constant volume gas thermometer works on:
(A) Archimedes’ principle
(B) Pascal’s law
(C) Boyle’s law
(D) Charle’s law

Answer 1

Hint: First of all, define the Archimedes’ principle and explain it. Then define Pascal’s law. After defining and explaining Pascal’s law then define Boyle’s law and later on define the term Charle’s law. A constant volume gas thermometer works on Charle’s law.

Complete solution:
A constant volume thermometer functions according to the condition, when the temperature of a gas increases, so does the volume.
Using Charles law, we can find the temperature can be measured by knowing the volume of gas at a certain temperature. And works on the same principle as mercury thermometers i.e. volume is directly proportional to the temperature of the gas.
Archimedes’ principle: If an object immersed in a fluid then it experiences a buoyant force that is equal in magnitude to the force of gravity on the displaced fluid.
Pascal’s law: It states that the external static pressure applied on a confined liquid is distributed or transmitted evenly throughout the liquid in all directions.
Boyle’s law: It is a fundamental gas law. It was discovered by Robert Boyle.
Statement: Boyle’s law states that volume of a given gas is inversely proportional to its pressure, provided that the temperature remains constant.
Charle’s law: Charle’s law gives the relationship between volume and the temperature of the gas at constant pressure.
Statement: Charle’s law can also be defined as when the pressure remains constant, the volume of a given mass of gas is directly proportional to its absolute temperature. The graph between temperature and volume is a straight line graph.

A constant volume gas thermometer works on the principle of Charle’s law.

Note: Charle’s law can also be defined as when the pressure remains constant, then the volume of the gas increases or decreases by the value $\dfrac{1}{{273.15}}$ of its volume at ${{\text{0}}^{\text{0}}}{\text{C}}$ for each ${1^{\text{0}}}{\text{C}}$ rise or fall of temperature. Charle’s law was discovered in $1787$. Charle’s law was discovered by Alexandra Charles.