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# Ch1-2 - Fluid Property Unit System Main Topics Unit System...

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1 Fluid Property & Unit System Main Topics Unit System Properties of Fluids Temperature, Density, Pressure Mass, Weight, Specific weight Specific gravity Viscosity 1 Chapter1 & Chpater2: 2.1~2.5 Systems of Units Property Is anything owned by someone such as land, building goods building, goods, … Property of fluid Is the physical quantity owned by a fluid Property often described with variables Physical properties must be stated with units ( why? ) 2

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2 Systems of Units A system of units Basic units & derived units Specify units of basic quantities of mass or force, length, time, temperature Units for other terms derived from basics In this course, two systems of units used SI, International System, (kg, m, s, K) (lbf f R) 3 US Customary System, (lbf, ft, s, o mass : 1 slug = 1 lbf·s 2 /ft; 1 slug=32.2 lbm English Engineering (lbf, lbm, ft, s, o R) Properties of Fluids Density , ρ Density is the mass per unit volume Unit: slug/ft 3 or kg/m 3 Water: ρ = 1.94 slugs/ft 3 or 1000 kg/m 3 Air: ρ = 0.00237slugs/ft 3 or 1.22 kg/m 3 If ρ = constant, the flow is i ncompressible If density varies significantly, the flow is bl 4 compressible Density of liquids Most liquids: density =constant
3 Properties of Fluids Density of Gases Gases are easy to compress If no large pressure fluctuations, gas treated as incompressible ( ρ =C) Otherwise, gas often treated as ideal gas P= ρ RT, (R value read in TA.2) Symbol Pressure P Density ρ Temperature T Gas Constant R 5 Temperature Gas Constant SI Pa (N/m 2 ) Kg/m 3 K (273+°C) J/(kg· K) US psf (lbf/ft 2 ) Slug/ft 3 °R(460+°F) ft·lbf/(slug ·°R) Properties of Fluids Specific Weight, γ

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