Question

How did Charles' law state the concept of absolute scale of temperature?

Answer 1

• Volume is directly proportional to the absolute temperature at constant pressure. This is Charle's Law.
  
• There was a very good reason that temperature must be absolute or Kelvin scale.
• This is because the temperature in Celcius scale can be negative due to which when we put the negative value of temperature, the volume also becomes
  negative, which is impossible.
  
• So, only Kelvin scale or absolute temperature is used so that at T=0, V=0