1 ). The relative density or specific density is the ratio of density of a substance with respect to the density of water at 40 C. Since the units for both the numerator and denominator in the ratio are same, they cancel each other. Therefore, relative density has no units.
2) A commercial ship is properly loaded when the ship's waterline equals the ship's Plimsoll line. Plimsoll mark on the hull of a floating ship. The Plimsoll line is a reference mark located on a ship's hull that indicates the maximum depth to which the vessel may be safely immersed when loaded with cargo.
3)Density changes with temperature because volume changes with temperature. Density is mass divided by volume. As you heat something up, the volume usually increases because the faster moving molecules are further apart. Since volume is in the denominator, increasing the volume decreases the density.
Answers & Comments
1 ). The relative density or specific density is the ratio of density of a substance with respect to the density of water at 40 C. Since the units for both the numerator and denominator in the ratio are same, they cancel each other. Therefore, relative density has no units.
2) A commercial ship is properly loaded when the ship's waterline equals the ship's Plimsoll line. Plimsoll mark on the hull of a floating ship. The Plimsoll line is a reference mark located on a ship's hull that indicates the maximum depth to which the vessel may be safely immersed when loaded with cargo.
3)Density changes with temperature because volume changes with temperature. Density is mass divided by volume. As you heat something up, the volume usually increases because the faster moving molecules are further apart. Since volume is in the denominator, increasing the volume decreases the density.
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