公式是airwatts(AW)=真空吸力[[inches of water]×空气流量[cfm]/8.5, 真空吸力[inches of water]和真空度kpa都是是真空度,只是计量单位不同,就像买牛肉一个以磅计量,一个以kg计量,真空度[inches of wate和真空度kpa本身是可以转换的, More @Wikipedia
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