Refreshing Technology Maintains 0.8 atm Vacuum*
Hitachi innovation at its finest and most consistent: the sealed pressure-resistent vacuum releases and maintains the vacuumed environment.A vacuum pump extracrts air reduces oxygen to achive approx 0.8 atm throughout usage.
*Vacuum means the space where the pressure is lower than the atmospheric pressure. The pressure in the Vacuum Compartment is about 0.8 atm, which is lower than the atmospheric pressure , hence , Hitachi considers this a vacuum.
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