Processes and Process Variables Chapter 3

Mass and Volume Density Specific Volume Specific Gravity mass/unit volume g/cm3 Specific Volume volume/ unit mass cm3/g Specific Gravity Dimensionless

Specific Gravity Ratio of the density of a substance to a reference substance at a specific condition SG=r/rref The reference is often the density of water at 4 C 1.000 g/cm3

What Does this mean? The density of the substance, measured at 20 C, is only 60% of the density of water, measured at 4 C

Flow Rate Mass flow rate Mass/time Volumetric flow rate Volume/time

Flow Rate Measurement Flowmeter Rotameter Orifice Meter

Moles and Molecular Weight Atomic Weight Molecular Weight gram-mole lb-mole

Mass and Mole Fraction Mass fraction Mole fraction

Concentration Mass concentration Molar concentration Molarity Mass/volume Molar concentration Moles/unit volume of the mixture Molarity Molar concentration in gram moles per liter of solution ppm and ppb

Pressure Measured in psi, pascals, bars Head 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

Atmospheric Pressure Absolute pressure Gauge pressure Pabsolute = Pgauge + Patmospheric

Pressure Measurement Bourdon Gauge Manometer Barometer We’ve covered all of this in thermodynamics

Temperature We’ve been here too Be sure you can use your calculator to make conversions between English and SI units

Next time - Homework Test on Tuesday 3.23 3.3 3.30 3.6 3.31 3.7 3.45 3.50 3.3 3.6 3.7 3.13 3.14 3.16 3.17 Test on Tuesday