# physical principles fluids

Aug 14th, 2016
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Physical Properties and Principles Related to HydrologyI.Review of Fundamental Physics in the Context of HydrologyA.Fundamental (Measurable) Physical Quantities1.Mass - a measure of the amount of matter contained in a given quantity of material(measure of matter's resistance to motion or inertia; scalar quantity with magnitudeonly)a.mass unitskg1 kg = 1000 g; 1 g =1000 mg2.Length - linear measure of distance (scalar quantity with magnitude only)a.length unitsm1 m = 100 cm; 1 km = 1000 m3.Time - passage of time measured in terms of motion or displacement of bodies inspacea.time unitssec 1 yr = 365 day; 1 day = 24 hr; 1 hr = 60 min, 1min =60 sec4.Temperature - measure of the amount of molecular kinetic energy ("heat")contained within a substance (i.e. > heat energy, >vibration rate of atoms /molecules, > temp.)a.temperature units(1)Conversion Factors:(a)(b)5.From C to F: F = 9/5C + 32oFrom F to C: C = 5/9(F - 32o)i)E.g. convert 40 C to FF = 9/5(40) + 32 = 104o FForce - the push or pull action on an object. Force is required to start an object inmotion from rest, or stop an object that is moving, or cause a moving object tospeed up or slow down.a.B.degree celsius (C) degree Fahrenheit (F)force unitsN (newton)1 N = 1 kg-m/s2 =1 kg-ms-2Geometric (Measurable) Physical Quantities1.2.3.4.AngleLengthAreaVolumemeasured in degreesLunits: m2A=Lunits: m23Vol =Lunits: m36circle = 360oThe SI uni

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