BMED Conversion Sheet PDF

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BMED Conversion Sheet...

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BME 2110: Supplementary Notes Basic Constants and Conversion Factors In engineering calculations, it is often necessary to convert from one system of units to another. The first step in the solution to many problems often involves conversion of the data to a more convenient system of units. Listed below are the most common constants and conversion factors. They are encountered repeatedly – please memorize them. Na=23.0 O=16.0 S=32.0

Fe=55.8 H=1.0 K=39.1 N=14.0

Atomic weights: C=12.0 Ca=40.0 Cl=35.5 Molecular weights:

Water = 18 Glucose = 180

Amino acid, avg = 135 Dry air = 28.84

DNA base pair, avg = 610 Protein, range = 5000 to 3x106

Length:

1 m = 100 cm = 1000 mm = 106 microns (µm) = 109 nanometers (nm) = 1010 angstroms 1 in. = 2.54 cm 1 mi. = 5,280 ft = 1.61 kilometers Typical mammalian cell, diameter = 10 μ m

Mass:

1 kg = 1000 g = 0.001 metric ton = 2.2 lbm 1 lbm = 16 oz = 454 gm = 0.454 kg = 5 x 10-4 ton

Volume:

1 m3 = 1000 L = 106 cm3 = 106 mL; 1 ft3 = 7.48 gal = 28.3 L Whole blood volume = 5 L (resting cardiac output = 5 L/min) Total lung capacity = 6.0 L, tidal volume = 0.500 L, breathing frequency = 12 breaths/min

Density:

1 gm/cm3 = 62.4 lbm /ft3 = 8.33 lbm/gal 1 gm mol of an ideal gas at 0°C, 760 mm Hg = 22.4 L 1 lb mol of an ideal gas at 32°F, 14.7 psia = 359 ft3

Pressure:

1 atm = 760 mm Hg at 0°C (torr) = 14.7 lbf/in.2 (psi) 1 atm = 29.92 in. Hg = 34 ft H2O 1 atm = 1.013 bar = 101.3 kPa = 1.013 x 106 dynes/cm2; 1 Pa = 1 N/m2 Systemic blood pressure = 120/80 mmHg

Temperature:

D1.0°C = D1.8°F or 1.0°C = 1.8°F Temperature conversion between Fahrenheit and Centigrade scales by: °F = 1.8(°C) + 32 °Rankine = °Fahrenheit + 460; °Kelvin = °Centigrade + 273 Room temperature = 25° C (298K); Body core temperature = 37° C (310K)

Force:

1 lbf = 32.174 lbm×ft/s2 = 4.448 N = 4.448 kg×m/s2 = 4.448 x 105 dynes 1 N = 1 kg×m/s2 1 dyne = 1 g×cm/s2

Composition of Air:

For most engineering calculations, dry air may be considered by volume as 79% N2, 21% O2 by mole percentage as 79% N2, 21% O2. by weight percentage as 76% N2, 24% O2 .

STP

Standard temperature and pressure (0°C, 1 atm)

Molar volume of an ideal gas at STP

22.4 L/mol = 359 ft3/lbm-mole...