Question

What remains constant in Charles Law?

Answer 1

1. Charles' law gives the relation between temperature and volume for an ideal gas.
2. It states that the volume of a gas is directly proportional to its temperature, at constant pressure and fixed mass.
3. It can be mathematically given as $\mathrm{V}\propto \mathrm{T}\Rightarrow \frac{\mathrm{V}}{\mathrm{T}}=\mathrm{constant}$
4. This law helped to define a new scale of temperature known as the Kelvin temperature scale, where the kelvin temperature was obtained by adding 273.15 $\mathrm{K}$ to the Celsius temperature.
5. On graphical representation, it gives a straight line, which on extrapolation to zero volume gives a temperature value of $-273.15°\mathrm{C}$.
6. Thus in Charles' law, the pressure of the gas remains constant as well as the mass remains the same.