Why is the specific weight of ocean water greater than that of pure water due to dissolved substances_________________?
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Answer: D. all of the above
Explanation
Ocean water has a greater specific weight than pure water due to dissolved salts, minerals, and suspended matter. Dissolved ionic solutes like sodium chloride increase the mass of a given volume without expanding it proportionally. This higher density and specific weight distinguish saline marine environments from freshwater river systems. Specific weight is defined as gravitational weight per unit volume of a fluid substance. Seawater salinity averages around thirty-five parts per thousand, elevating its density above standard pure water benchmarks. Oceanographic calculations account for temperature, pressure, and salinity when determining hydrostatic buoyancy forces.
Ship design engineers must calculate buoyancy accurately using seawater specific weight values rather than freshwater data. Submarines experience different ballast requirements when transitioning from low-density river mouths into high-density oceans. Marine ecosystems and ocean currents depend heavily on density gradients driven by dissolved mineral content. Dissolved air contributes negligibly to the overall specific weight compared to heavy mineral salts. Dissolved salt represents the primary chemical solute responsible for increasing seawater specific weight. Suspended matter adds minor particulate weight, but dissolved mineral salts dominate marine density properties.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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