  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.
World's Largest X-band Radar. Raytheon's nine-story-high X-band Radar (XBR) is the world's largest X-band radar. The sea-based X-band (SBX) platform that it sits on stands more than 250 feet high and displaces more than 50,000 tons. It consists of a semi-submersible oil production platform topped with the XBR.