Question

What is significant about the temperature absolute zero

Answer 1

It's $0K$ (kelvin) corresponds to $-273.15^oC$ ($=-459,67 ^oF$).

In theory, it is impossible to go below the absolute temperature.

Answer 2

0 K on the Kelvin scale, which is absolute temperature scale; and –273.15 degrees Celsius on the Celsius scale, thus world wide has come to an agreement saying absolute zero is precisely.