What we're going to get then is mass per unit area.
所以我们的到的是单位面积上的质量。
The density for a flat object would be the mass per unit area.
一个平面物体的密度是每单位面积元的质量。
So these two together, l times rho, give us mass per unit area.
这两个量，l乘以ρ,一起给出单位面积上的质量。
ASTM D5848 Standard Test Method for Mass Per Unit Area of Pile Yarn Floor Coverings.
ASTMD5848簇绒纱线地毯单位面积质量的试验方法。
ASTM D5848 Standard Test Method for Mass Per Unit Area of Pile Yarn Floor Coverings.
ASTMD5848簇绒纱线地毯单位面积质量的试验方法。
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