A theoretically lowest possible temperature is considered to be -273 °C or 0K , at which a substance would have no molecular motion and no heat , This is called absolute zero.
There's a catch, though: absolute zero is impossible to reach. The reason has to do with the amount of work necessary to remove heat from a substance, which increases substantially the colder you try to go. To reach zero kelvins, you would require an infinite amount of work.Absolute zero, temperature at which a thermodynamic system has the lowest energy. It corresponds to −273.15 °C on the Celsius temperature scale and to −459.67 °F on the Fahrenheit temperature scale.
Now the zero in absolute zero makes sense: Absolute zero is the temperature at which the particles in a substance are essentially motionless. There's no way to slow them down further, so there can be no lower temperature.As close as you can get to absolute zero a person does not technically die. He can't die. Dying means that your body starts to deteriorate.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.
Nothing in the universe — or in a lab — has ever reached absolute zero as far as we know. Even space has a background temperature of 2.7 kelvins. But we do now have a precise number for it: -459.67 Fahrenheit, or -273.15 degrees Celsius, both of which equal 0 kelvin.The theoretical temperature is determined by extrapolating the ideal gas law; by international agreement, absolute zero is taken as −273.15° on the Celsius scale (International System of Units), which equals −459.67° on the Fahrenheit scale (United States customary units or Imperial units).
if the human body were to reach absolute zero somehow, it would stop all motion and become truly lifeless, same as any other object. Absolute zero is — 273° celcius . ... Well to reach that point first all of the cells in the human body would probably burst as it approaches 0 degrees Kelvin.