因此，当他们各自在空气中称重量的时候，空气浮力将使前者更重。
Hence when they are respectively weighed in air, the buoyancy of the air will render the former heavier.
将岩心样品洗净烘干并称重，然后把样品放到真空箱中抽空其内的空气（必要时充入CO2驱替掉空气）。
A clean, dry sample is weighed and then evacuated for several hours in a vacuum chamber, flushing with CO2 to remove remaining air if necessary.
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