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41 Cards in this Set
- Front
- Back
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Feet in a mile
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5280 ft
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Atmospheric Concentration of Oxygen
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20.95%
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Density of water
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1 g/cm^3 = 1 g/ml
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Specific gravity
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Specific gravity is the ratio of the density (mass of a unit volume) of a substance to the density (mass of the same unit volume) of a reference substance. The reference substance is nearly always water for liquids or air for gases.
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Absolute temperature scale
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0 K = -273 C = -459 F
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Normal Temperature
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293 K = 20 C = 68 F
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Normal Pressure
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1 atm = 101.3 kPa = 14.7 psia = 29.92"Hg
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Time Weighted Average
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TWA=[(C1*T1)+...(Cn*Tn)]/(T1+...Tn)
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Molarity
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M=(moles of solute)/(liters of solution)
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Normality
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N=(mols of ions)/(liters of solution)
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Atomic Number
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Number of protons in an element.
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Atomic Mass
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Number of protons and neutrons in the nucleus of an element.
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prefix milli-
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x 10^-3
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prefix micro-
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x 10^-6
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prefix nano-
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x 10^-9
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prefix kilo-
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x 10^3
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prefix mega
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x 10^6
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prefix giga-
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x 10^9
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Hertz (Hz)
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Frequency (per second)
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Liters in a cubic meter
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1000
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ppm
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#/10^6
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ppb
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#/10^9
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Watt
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Unit of power = joule per second
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Joule
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Unit of energy = 1 kg*m^2/s^2 = 2.39 x 10^-4 kcal = 1W*s
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Area of a circle
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pi * r^2
pi*d^2/4 |
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Molecular weight of water
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18 g/mol
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Molar volume gas at normal temperature and pressure
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24.45 L/mol
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Definition of fiber
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3:1 aspect ratio
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Area of microscope graticule field - asbestos
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0.00785 mm^2
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Fume
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Precipitate of an evaporated substance, commonly metal (e.g., welding fume)
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Isotope
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Different atomic weight of an element (i.e., neutron is variable)
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Isotope
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Different atomic weight of an element (i.e., neutron is variable)
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Respirable particulate matter
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Particles with a 50% cutpoint at 4 micrometers
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Raoult's Law
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Pa=Xa*Pao
Pa = pressure of component A Xa = mole fraction of component A Pao = vapor pressure of pure component A |
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Ideal Gas Law
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PV=nRT
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Charles' Law
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V1/T1=V2/T2
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Fick's Law
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J = -D [(A(Co-C1))/L)]
J = diffusion flux (mass/time) D = diffusion coefficient (mass/length*time) A = Area C = Concentration L = diffusion path length |
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e
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2.72
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95% confidence interval (2 sided test of mean)
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X +/- 1.96 (SD/n^(1/2))
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Upper 95% confidence (1 sided limit of mean)
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X + 1.645 (SD/n^(1/2))
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Lower 95% confidence (1 sided limit of mean)
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X - 1.645 (SD/n^(1/2))
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