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Units and Conversion Factors
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So you want to convert from Haggaboks to Nitnerbabs, but what is the conversion factor? Well, while many of the unit names aren't as esoteric (Haggaboks and Nitnerbabs don't even exist, even in our bizaare minds) the conversion factors may be the weirdest combination of digits you might ever have seen. Luckily we list the most common and useful ones below:
| SI PREFIXES | ||
|---|---|---|
| Prefix | Symbol | Factor |
| yotta | Y | 1024 |
| zetta | Z | 1021 |
| exa | E | 1018 |
| peta | P | 1015 |
| tera | T | 1012 |
| giga | G | 109 |
| mega | M | 106 |
| kilo | k | 103 |
| hecto | h | 102 |
| deka | da | 101 |
| deci | d | 10-1 |
| centi | c | 10-2 |
| milli | m | 10-3 |
| micro | m | 10-6 |
| nano | n | 10-9 |
| pico | p | 10-12 |
| femto | f | 10-15 |
| atto | a | 10-18 |
| zepto | z | 10-21 |
| yocto | y | 10-24 |
LENGTH
1 m = 100 cm = 1000 mm = 106 mm = 109 nm
1 km = 1000 m = 0.6214 mi
1 m = 3.281 ft = 39.37 in.
1 cm = 0.3937 in.
1 in. = 2.540 cm
1 ft = 30.48 cm
1 yd = 91.44 cm
1 mi = 5280 ft = 1.609 km
1 Å = 10-10 m = 10-8 cm = 10-1 nm
1 nautical mile = 6080 ft
1 light year = 9.461 x 1015 m
AREA
1 cm2 = 0.155 in2
1 m2 = 104 cm2 = 10.76 ft2
1 in2 = 6.452 cm2
1 ft2 = 144 in2 = 0.0929 m2
VOLUME
1 liter = 1000 cm3 = 10-3 m3 = 0.03531 ft3 = 61.02 in3
1 ft3 = 0.02832 m3 = 28.32 liters = 7.447 gallons
1 gallon = 3.788 liters
TIME
1 min = 60 s
1 h = 3600 s
1 d = 86,400 s
1 y = 365.24 d = 3.156 x 107
ANGLE
1 rad = 57.30° = 180° / 2p
1° = 0.01745 rad = p/180 rad
1 revolution = 360° = 2p rad
1 rev/min (rpm) = 0.1047 rad/s
SPEED
1 m/s = 3.281 ft/s
1 ft/s = 0.3048 m/s
1 mi/min = 60 mi/hr = 88 ft/s
1 km/hr = 0.2778 m/s = 0.6214 mi/hr
1 mi/hr = 1.466 ft/s = 0.4470 m/s = 1.609 km/hr
1 furlong/fortnight = 1.662 x 10-4 m/s
ACCELERATION
1 m/s2 = 100 cm/s2 = 3.281 ft/s2
1 cm/s2 = 0.01 m/s2 = 0.03281 ft/s2
1 ft/s2 = 0.3048 m/s2 = 30.48 cm/s2
MASS
1 kg = 103 g = 0.0685 slug
1 g = 6.85 x 10-5 slug
1 slug = 14.59 kg
1 u = 1.661 x 10-27
1 kg weights 2.205 lb when g = 9.80 m/s2
FORCE
1 N = 105dyn = 0.2248 lb
1 lb = 4.448 N = 4.448 x 105dyn
PRESSURE
1 Pa = 1 N/m2 = 1.450 x 10-4 lb/in2 = 0.209 lb/ft2
1 bar = 105 Pa
1 lb/in2 = 6895 Pa
1 lb/ft2 = 47.88 Pa
1 atm = 1.012 x 105 Pa = 1.013 bar = 14.7 lb/in2 = 2117 lb/ft2
1 mm Hg = 1 torr = 133.3 Pa
ENERGY
1 J = 107 ergs = 0.239 cal
1 cal = 4.186 J (15° calorie)
1 ft lb = 1.356 J
1 Btu = 1055 J = 252 cal = 778 ft lb
1 eV = 1.602 x 10-19 J
1 kWh = 3.600 x 106 J
POWER
1 W = 1 J/S
1 hp = 746 W = 550 ft lb/s
1 Btu/hr = 0.294 W
Clyde, Chetan, JimMelanie Krieger, Chhaya Taralekar