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Вот, нашел глоссарий: Bulk Density (Loose)
The loose bulk density (sometimes called the poured bulk density) of a bulk material is the weight per unit of volume (usually pounds per cubic foot) that has been measured when the sample is in a loose, non-compacted or poured condition. The loose bulk density may be close to the 'as conveyed" bulk density and is preferred for the purposes of pneumatic conveying system design. Bulk Density (Packed)
The packed bulk density of a bulk material is the weight per unit volume (usually pounds per cubic foot) that has been measured when the sample has been packed or compacted in. For instance, a silo or bin or after containerized transportation. The packed bulk density does not compare to the conditions that the loose bulk density is preferred for the purposes of conveying system design.
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