AERODYNAMICS
Constants
1. Pressure
๐
๐ = 1 atm
= 29.92 in Hg
= 2116.8 psf
= 14.7 psi
= 760 mmHg
= 760 TORR
= 101325 Pa
= 101.325 kPa
= 1013.25 millibar
= 1.01325 bar
2. Temperature
๐
๐ = 288 K = 15 โ
= 519 R = 59 โ
3. Gas Constant
R = 287.08 ๐ฝ
๐๐ โ๐พ
= 53.342 ๐๐๐ โ๐๐ก
๐๐๐ โ๐
= 1716 ๐๐๐ โ๐๐ก
๐ ๐๐ข๐ โ๐
4. Density
๐๐ = 1.225 ๐๐
๐3
= 0.002378 ๐ ๐๐ข๐
๐๐ก3
5. Viscosity
๐๐ = 1.7894 x 10โ5 ๐๐
๐โ๐
= 3.73 x 10โ7 ๐ ๐๐ข๐
๐๐กโ๐
6. Gravity
g = 9.81 ๐
๐ 2
= 32.174 ๐๐ก
๐ 2
CONVERSION
Factors
1. Force
1 ๐๐๐ = 4.448 N
2. Power
1 hp = 746 W
= 550 ๐๐ โ๐๐ก
๐
= 7,456,998,715.82 ๐๐๐
๐
= 42.4 ๐๐ก๐ข
๐
1 BTU = 778.169 ๐๐ โ ๐๐ก
1 ๐๐ โ ๐๐ก = 1.35582 J
3. Time
1 min = 60 s
1 hr = 3600 s
1 day = 24 hrs
14 days= 1 fortnight
1 week = sennight
4. Mass
1 slug = 32.2 ๐๐๐
1 ๐๐๐ = 9.8066 N
1 ๐๐๐ = 32.174 pdl ( 1 poundal = ๐๐โ๐๐ก
๐ 2 )
1 kg = 2.2 ๐๐๐
1 tonne = 1000 kg = 0.984 long ton
1 long ton = 2240 lbs
1 short ton = 2000 lbs
1 ounce = 28.35 grams
1 grain = 0.065 grams
1 dram = 1.772 grams
5. Length
1 meter = 3.28 ft
1 inch = 2.54 cm = 1000 mils
1 mile = 5280 ft = 8 furlongs
1 statute mile = 1760 yards
1 nautical mile = 6076.1 ft = 1.15 miles
1 fathom = 6 feet
1 cable = 120 fathoms
1 league = 3 miles
1 rod = 5.5 yards
1 yard = 3 ft
6. Area
1 hectare = 1000 ๐2
1 acre = 4046.86 ๐2
1 are = 100 ๐2
7. Volume
1 L = 1 kg
1 ๐3 = 1000 L
1 quarts = 0.75 gallons
1 pint = 0.5 quarts
1 peck = 1 gallon
1 bushel = 4 pecks
