processes and process variables chapter 3. mass and volume density mass/unit volume g/cm 3 ...
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Processes and Process Variables
Chapter 3
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Mass and VolumeDensity
mass/unit volume g/cm3
Specific Volume volume/ unit mass cm3/g
Specific Gravity Dimensionless
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Specific GravityRatio of the density of a substance to a
reference substance at a specific condition
SG=ref
The reference is often the density of water at 4 C 1.000 g/cm3
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What Does this mean?
0
0
4
206.0SG
The density of the substance, measured at 20 C, is only 60% of the density of water, measured at 4 C
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Flow RateMass flow rate
Mass/timeVolumetric flow rate
Volume/time
V
m
V
m
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Flow Rate MeasurementFlowmeter
Rotameter Orifice Meter
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Moles and Molecular WeightAtomic WeightMolecular Weightgram-mole lb-mole
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Mass and Mole FractionMass fraction
Mole fraction
mass total
A of massAx
moles total
A of molesAy
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ConcentrationMass concentration
Mass/volumeMolar concentration
Moles/unit volume of the mixtureMolarity
Molar concentration in gram moles per liter of solution
ppm and ppb
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PressureMeasured in psi, pascals, barsHead
Height of a column of water or mercury 1 atm = a head of 33.9 ft of water 1 atm = a head of 760 mm of Hg
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Atmospheric PressureAbsolute pressureGauge pressure
Pabsolute = Pgauge + Patmospheric
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Pressure MeasurementBourdon GaugeManometerBarometer
We’ve covered all of this in thermodynamics
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TemperatureWe’ve been here tooBe sure you can use your calculator to
make conversions between English and SI units
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Next time - Homework 3.23 3.30 3.31 3.45 3.50
3.3 3.6 3.7 3.13 3.14 3.16 3.17
Test on Tuesday