Question

Why is it impossible to reach $0Kelvin$?

Answer 1

It is impossible to reach $0K$ because:

1. Zero kelvin $\left(-273.15C\right)$, also known as absolute zero is the lowest temperature possible on the kelvin scale which is physically unattainable. Nothing can be colder than $0K$ on the kelvin scale.
2. According to the third law of thermodynamics, “ A system has $0$ entropy at $0K$ if and only if the system is in the pure state.”
3. Since a system can not avoid $100\%$ interaction with the environment and always exchange energy with the surroundings, it is impossible to achieve $0K$temperature.
4. Also, according to Heisenberg's uncertainty principle, “Reaching $0K$ means there is no particle moving, which implies that the system is in a state where we can know the momentum and position of the particle at the same time, which is not possible.”
5. So $0K$ cannot be attained.

Hence, it is impossible to reach $0K$.