Question

Why all temperatures in Kelvin scale are in positive figures

Answer 1

At zero kelvin (minus 273 degrees Celsius) the particles stop moving and all disorder disappears. Thus, nothing can be colder than absolute zero on the Kelvin scale. ... Hot minus temperatures: At a negative absolute temperature the energy distribution of particles inverts in comparison to a positive temperature.

Answer 2

Because -273.15 °C is considered to be absolute zero and upto this temperature all ideal gases liquefied and we know kelvin scale is Celsius scale + 273.15 so the least value of kelvin will be zero (not negative)