Naela kuupjala kohta, tähis lb∙ft⁻³ või lb/ft³, on materjali tiheduse ehk ruumalaühiku massi mõõtühik, mis näitab materjali kindla ruumala massi, nt vee tihedus on ligikaudu 62,4 lb/ft³ ja terasel on suur tihedus, umbes 487 lb/ft³.
Pound per cubic foot (symbol lb∙ft-3 or lb/ft³) is a unit of measurement for material density or volumetric mass, and it tells you how heavy a specific volume of a material is. Examples: water has as a density of about 62,4 lb/ft³, and steel has a high density of about 487 lb/ft³.
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