generally abou 3-5%, it will not affect the appearance of the cause of malaise, softening, no freshness and so on.As vacuum cooling,the pressure difference of vegetable organization between inside and outside, harmful gases and heat within the organization also will be withdrawn,any other method of cooling is from the outer surface to the internal organization slowly penetration , and cooling under vacuum, the cooling from the inside to the outer surface of the tissue at the same time, which is