  Crushed stone, for example, has a density of 100 pounds per cubic foot (lb/ft3), which is 1600 kilograms per cubic meter (kg/m3), which is 1.6 metric tons per cubic meter. Packed earth is about 95 lb/ft3, or 1520 kg/m3.
Harvard Business Review. Harvard Business Review. The Harvard Business Review (HBR) is a general management magazine published by Harvard Business Publishing, a wholly owned subsidiary of Harvard University. It is published 6 times a year and is headquartered in Brighton, Massachusetts.
The attachment of HBR to the heterophilic antibodies renders the heterophilic antibodies incapable of cross-linking the capture and the label antibodies in the immunoassay. The HBR is a liquid reagent with a protein concentration of 2 Â± 0.1 mg/ml.