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The former Milford Haven Comprehensive School pupil said: "Making ice cream with liquid nitrogen means you can freeze it instantly at a temperature of -330F (around -200C).
DEEP FREEZE: Hazel Smith tries liquid nitrogen frozen ice cream made by David Clokey and Craig McDonald of The Gray Ox, Hartshead, at the Mirfield Show, and, right, their inspiration TV chef Heston Blumenthal (JH210811Bmirfield)
MS--the module of liquid nitrogen stocking, with the role to create a super-pressure in the Dewar-type cooling vessel and the transport of the liquid through the installation;
The system provides a jet of -320[degrees]F liquid nitrogen directly to the insert during turning operations.
Gas purity in the OPCs is maintained using liquid nitrogen traps and a getter.
Yesterday's Ice Cream Sunday, which included a three-course ice cream meal, looked at the problems behind the perfect cone, from the beginning of its history - with liquid nitrogen being used as far back at 1908 - to the influence of packaging and advertising, perceptions of flavours, and stabilisers used to keep ice cream at its best.
Spokesman Bob Pirie, of BOC, who produce liquid nitrogen, said it could cause cold burns or frostbite and in high concentrations could also affect breathing.
The system protects the cells by freezing them in the liquid nitrogen vapor phase compartment above the liquid nitrogen in the closed storage dewar system and then moves the cells to a specific address in the liquid nitrogen in the dewar without opening the system.
A portion of the 6,500 gallons, stored under pressure, was released through a safety vent, causing a small gas cloud and leaving a 120-square-foot frozen sheet of liquid nitrogen.
Airco's standard liquid nitrogen freezer (Model KFS 21-300) operates by injecting liquid nitrogen into a box filled with either precooked or raw seafood.
The liquid nitrogen pump operates oil-free which eliminates the risk of gas contamination.