13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21,...
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Transcript of 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21,...
![Page 1: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/1.jpg)
13 Fluids
• density
• pressure in a fluid
• buoyancy and archimedes’ principle
• Fluids in motion
• Hk: 21, 31, 33, 41, 43, 55.
![Page 2: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/2.jpg)
Density
• = mass/volume
• SI Unit: kg/m3
• common unit: g/cm3
• 1,000 kg/m3 = 1 g/cm3
![Page 3: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/3.jpg)
Pressure, p
• p = force/area
• Unit: pascal, Pa
• 1 Pa = 1N/m2.
• Example: 100N applied to 0.25m2. Pressure = 100/0.25 = 400N/m2.
![Page 4: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/4.jpg)
Pascal’s Principle
AdF
AdFMA
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Bulk Modulus
• B = -P/(V/V)
• compressibility = 1/B
• liquids have large B
• gasses have smaller B
![Page 6: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/6.jpg)
Depth and Fluid Pressure• P = Po + gd
• P is the pressure at depth d.
• Po is the pressure at the fluid surface
• is the fluid density
• Example: increase in pressure at a depth of 1m in water = (1,000)(9.8)(1.0) Pa
![Page 7: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/7.jpg)
Buoyancy and Archimedes’ Principle
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vv AA
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At same velocity: lower height fluid is at greater pressureAt same height: faster moving fluid = less pressure
![Page 10: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/10.jpg)
Summary
• Density = mass/volume
• pressure in a fluid varies with depth
• Buoyant force = weight of displaced fluid
• Fluids in motion
• /
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Gauge Pressure is Differential Pressure
![Page 12: 13 Fluids density pressure in a fluid buoyancy and archimedes’ principle Fluids in motion Hk: 21, 31, 33, 41, 43, 55.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697bfbd1a28abf838ca1d39/html5/thumbnails/12.jpg)
)76.0)(/8.9)(/600,13(0 3 mkgNmkgghP
Barometer
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