How does the bulk modulus of elasticity respond to an increase in fluid pressure__________________?
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Answer: A. increases
Explanation
Bulk modulus measures a fluid resistance to uniform compression, indicating how easily its volume changes under pressure. As external fluid pressure increases, the molecules are forced closer together, which increases the intermolecular repulsive forces. These stronger internal forces make the fluid increasingly resistant to further compression, resulting in a higher bulk modulus. The bulk modulus of elasticity is mathematically defined as the ratio of pressure increase to the resulting volumetric strain. Liquids are generally considered incompressible under low pressures, but their bulk modulus rises noticeably at very high pressures. Water has a bulk modulus of approximately two gigapascals at standard atmospheric conditions, which increases under deep oceanic pressures.
Decreasing fluid pressure would reduce the intermolecular spacing resistance, thereby lowering the bulk modulus instead of raising it. Remaining constant is incorrect because experimental data clearly shows fluid compressibility changes non-linearly under high pressure. The behavior is fully predictable and well-documented by thermodynamic equations of state, ruling out unpredictable or complex dual trends.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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