Specific weight is defined as weight per unit volume at standard temperature and pressure; thus, the specific weight of water equals ____________ kg/m3 in the MKS system?
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Answer: D. 1000
Explanation
Specific weight represents the gravitational force acting per unit volume of a given fluid substance. Pure water has a mass density of one thousand kilograms per cubic meter in standard conditions. Multiplying this mass density by standard gravitational acceleration yields the specific weight of 1000 kgf per meter cubed. The MKS system utilizes kilograms for mass and meters for length in engineering calculations. Fluid properties vary slightly with temperature, but standard reference values are taken at four degrees Celsius. Specific weight is a fundamental property used extensively in hydrostatics and open channel hydraulics.
Civil engineers use specific weight values to calculate hydrostatic pressures acting on dams and retaining walls. Buoyancy computations for floating structures and submerged pipelines depend directly on this fluid property. Water treatment facilities rely on accurate density parameters for chemical dosing and basin sizing. Option A underestimates the standard density of water typically utilized in basic engineering design problems. Option B represents a slightly reduced density value associated with elevated water temperatures. Option C is extremely close but standard MKS calculations use the exact integer value of 1000.
- Subject
- Agriculture
- Category
- Agriculture
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- —
- Difficulty
- medium
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