Liquid mercury is frequently chosen as a barometric fluid because____________________?
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Answer: D. both B. and C.
Explanation
Liquid mercury is chosen for barometers because its high density keeps the required column height manageable. Its extremely low vapor pressure ensures that the space above the liquid column remains a near-perfect vacuum. Both of these favorable physical properties make mercury ideal for precise barometric pressure measurements. Atmospheric pressure supports a column of liquid balanced against gravitational forces acting on the fluid. Water barometers would require columns exceeding ten meters high due to water's much lower density. Vapor pressure represents the tendency of liquid molecules to escape into the gaseous headspace above.
Mercury barometers are classic meteorological instruments used for accurate atmospheric pressure readings in laboratories. Compact instrument design is essential for practical laboratory equipment and field measurement devices. High vapor pressure would create gas pockets at the top of the tube, rendering pressure readings inaccurate. Stating it is simply the best liquid lacks specific scientific justification regarding its physical properties. While a shorter column height is correct, ignoring vapor pressure properties provides an incomplete explanation. Mercury's ease of movement relates to its low viscosity rather than its barometric fluid suitability.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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