Dear Student....Scientists believe that the lowest possible temperature that can be achieved is -273.15 degrees centigrade. This temperature, which is also called absolute zero temperature.......It is impossible to reach 0 degrees kelvin temperature. The lowest temperature so far reached in laboratories is of the order of 0.00001 degree kelvin.....absolute zero is actually a theoretical quantity which can only be approached, but never achieved. ...With Regards ....Mahima...(Askiitians Forum Expert )