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Chapter14 pt 2

Chapter14 pt 2 - Chapter 14 Fluid Mechanics 1 Density Fluid...

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Unformatted text preview: Chapter 14: Fluid Mechanics 1. Density Fluid: A substance that can flow and conform to the shape of a container. Liquids and gases are fluids. Density : mass per unit volume, unit: kg/m 3 For water at 4 °C, ρ=1000 kg/m 3 =1 g/cm 3 Originally, g/cm 3 was used. The reason for water’s density being 1. For mercury (Hg), 13.6 × 10 3 kg/m 3 Specific gravity : the ratio of material’s density to the density of water. For mercury, specific gravity is 13.6 2. Pressure in a Fluid Pressure : the normal force per unit area Unit : Pa (pascal)=N/m 2 Atmospheric pressure 1 atm=1.013 × 10 5 Pa = 1.013 bar =1013 mbar =1013 hPa Pressure and depth The pressure is the same at any two points at the same level in the fluid. Pascal’s Law : Pressure in a confined fluid is transmitted unchanged to all parts of the fluid and to the containing walls. Mercury barometer 1 atm=760 mmHg=760 Torr Gauge pressure : excessive pressure above the atmospheric pressure gauge pressure = absolute pressure (total pressure)- atmospheric pressure Problem 14-57) A U-shaped tube open to the air at both ends contains some mercury. A quantity of water isends contains some mercury....
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Chapter14 pt 2 - Chapter 14 Fluid Mechanics 1 Density Fluid...

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