Question

Why is it impossible to get a temperature below -273 C and 0k?

Answer 1

Temperature is a way of measuring something's energy. There is no such thing as negative energy. The reason a temperature can not sink below -273 C (absolute zero) is because that is the temperature at which there is no energy present. You cannot have less than zero energy. In terms of energy, you can't take something away from nothing.

Answer 2

Thanks

Answer 3

No Problem.

Answer 4

Heat is the consequence of random motion in matter. At absolute zero, molecular activity ceases and the molecules stop moving. Therefore, temperature cannot get lower than absolute zero.
If you know the statement of the Uncertainty Principle, then you can understand that the molecules cannot totally stop moving though become that would make the uncertainty in position zero, consequently making their uncertainty in momentum infinity. So even at absolute zero, they do possess a minimum amount of energy called Zero-point energy.

If you like you can read this up on Wikipedia.
http://en.wikipedia.org/wiki/Zero-point_energy

Answer 5

@Aditya790
Heat is the consequence of random motion in matter
that is not a correct stetement
heat is the trancferance of Kinetic energy from molucule to molucule of random motion in matter