Fluids.pdf

Fluids.pdf - Fluids(Liquids and gasses Density mass...

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11/9/16 Fluids (Liquids and gasses) Density: mass/ volume (SI units: kg/m^3) Different for different materials; maximum for solids and minimum for gases Liquids are in between those of solids and gasses It varies with temperature, molecular bonds, Density of blood= 1060 kg/m^3 Water = 1000 kg/m^3 Oil = 800 kg/m^3 Specific gravity: relative density Ratio of density of a substance, any substance, divided by density of water at 4˚C Density of water at 4˚C = 1000 kg/m^3 #1) If specific gravity of steel is 7.8, what is the density of steel? #2) A student of mass 60 kg, have 5.3 x 10^-3 m^3 of blood. What is the ratio of mass of blood/mass of student? Pressure Pressure = force exerted/unit area Increase area, pressure decreases Decrease area, pressure increases When area of cross section is small, pressure is large #3) A 45 kg student is standing on one foot with area of heel is 1.2 x 10^3 m^2. What is the pressure exerted if she stands on both feet, how does pressure change?

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