“Cryogenics” refers to temperatures below -150℃. Air and other “permanent gases” liquefy or solidify at these temperatures. Applications of cryogenics are in diverse fields: space exploration, high energy physics, magnetic levitation transportation, in steel, plastics, fertilizer, petrochemical, dairy industries, in medical applications such as cryoprobes in cryosurgery, whole body imaging etc. “Cryogenic Engineering” deals with production, transportation and utilization of cryogenic liquids. …