Cryogenics Means the Production of Cold. Conventionalrefrigeration Operates from - 30 C Upwards. By Definition Cryogenics Deals With Temperatures In the Range -150 C(123 K) Downwards. Absolute Zero Is the Lowest Temperature One May Approach.The Temperature of Melting Ice In the Centigrade Scale Is Zero. Its Temperatureon the Absolute Scale Is 273 K.