tain a high degree of fresh and clean fruits and vegetables. among them, vacuum cooling is currently the world one of the most advanced preservation technology
The basic principle of vacuum cooling: at normal atmospheric pressure, the water was evaporated at 100 deg.] C, and atmospheric pressure is 610Pa, the water will evaporate at 0 ℃, because the boiling point of water with the decrease of the atmospheric pressure decreases, which as in the high people latitudes are not able to find water t