How did Charles' law lead to the concept of an absolute scale of temperature?

According to Charles' law, when pressure (P) is constant,

$\text{V} = \text{V}$0 + \dfrac{\text{V}0}{273}\text{t} \\[1em] \Rightarrow \text{V} = \text{V}_0\Big(\dfrac{273 + \text{t}}{273}\Big)

∴ Volume at -273°C = $\text{V}_0\Big(\dfrac{273 - 273}{273}\Big)$ = 0

Hence, the volume of a gas would be reduced to zero at -273°C. This temperature is called absolute zero.

This allowed the scientists to establish an absolute temperature scale (known as Kelvin scale) by defining absolute zero as the point where volume of a gas would theoretically be zero.