Civil and Environmental Engineering 2224 Study Guide - Quiz Guide: Newtonian Fluid, Pressure Measurement, Ideal Gas Law
3 Apr 2017
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Properties of fluids review 1: ratio of fluid density to the standard reference fluid, water for liquid and air for gases incompressible. Specific gravity (relative density), s or sg: variable in gases but nearly constant in liquids, so liquids are treated as. Density, : mass per unit volume, = mv. Specific weight, : weight per unit volume, = g, sgliquid= liquid. Water: reciprocal of density, i. e. volume occupied by a unit mass of fluid, sv=(cid:883) , dynamic viscosity, is the constant of proportionality required in =dudy, kinematic viscosity, = rate of deformation with temperature. Absolute pressure, pabs: pressure measured relative to a pure vacuum, pabs = 0 when no molecules are present in a space, pabs can never be less than zero. Gauge pressure, pgauge: measured relative to reference pressure of the local atmospheric pressure. Pabs = patm + pgauge: if the gauge pressure is negative, it may be called a vacuum.
