# unsat2 - Phase Relationships Phase Properties Density = M V...

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Phase Relationships Phase Properties Density ρ α = M α / V α = mass per unit volume α = s(soil), w(water) or a(air) Specific volume v α 0 = V α / M α Ideal gas law (for moist and dry air) α u V α = (M α / ω α ) R T u = absolute press. = gage press. + atmos. press. ω α = molecular mass of air Boyle's law (closed system) 1 a u V a1 = 2 a u V a2 Relative humidity R H = v u / 0 v u = ratio of partial to saturation pressure o f w a t e r v a p o r Unsat2 - 1

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Absolute or dynamic viscosity Measure of resistance to shearing by a fluid. Viscosity of a liquid increases as temperature decreases. Viscosity of a gas decreases as temperature decreases. Surface tension, T s T s β β R s Σ F v = 0 2T s sin β = 2 uR s sin β u = T s / R s u a – u w = T s / R s T s β β u+ u u Results from unbalanced pressures (u and u + u acting towards the interior of the water volume. Since there is a net inward force, the water molecules at the interface deform inward (meniscus) and exert an attractive force upon each other to satisfy equilibrium. The magnitude of the attractive force between the water molecules in the contractile skin depends on temperature.
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unsat2 - Phase Relationships Phase Properties Density = M V...

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