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Formulas
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- Mass
-
- 1.00 lb = 0.454 kg = 4.45 N
- 1.00 kg = 2.20 lbs = 9.81 N
- 1.00 N = 0.102 kg = 0.220 lb
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- Distance
-
- 1 in = 2.54 cm = 0.0000158 mi = 0.0000254
km
- 1 cm = 0.394 in = 0.00000621 mi = 0.00001
km
- 1 ft = 30.5 cm = 0.000189 mi = .000305
km
- 1 mi = 63,360 in = 160,934.4 cm = 1.609
km
- 1 km = 0.621 mi = 100,000 cm = 3281 ft
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- Pressure
-
- 1.00 bar = 14.5 psi = 1.02 kg/sq-cm = 100
kPa
- 1.00 psi = 0.069 bar = 0.070 kg/sq-cm = 6.89
kPa
- 1.00 kg/sq-cm = 0.980 bar = 14.2 psi = 98.1
kPa
- 1.00 kPa = 0.010 bar = 0.145 psi = 0.010
kg/sq-cm
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- Temperature
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- F = 9 / 5 x C + 32
- C = 5/9 (F - 32)
- K = C + 273.4
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- Area / Volume
-
- 1.00 sq-in = 6.452 sq-cm
- 1.00 sq-cm= 0.155 sq-in
- 1.00 cu-in = 16.387 cc
- 1.00 cc = 0.0610 cu-in
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- Power
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- 1.00 HP = 746 W
- torque (lb-ft) = 5252 x hp / rpm
- hp = rpm x torque (lb-ft) / 5252
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The Weight of Air
- 14.7 lbs. per sq. inch at sea level.
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Air Density Calculation
- StdAirDensity = 1.22556 and is defined at
59.0F degrees, 0.0% humidity, and 29.92 inches
on the barometer.
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- Temp_c = (Temp-32.0) * 5.0 / 9.0;
- Temp_k = Temp_c + 273.0;
- Baro_mb = Barometer / (29.92 / 1013.0);
- Baro_pa = Baro_mb * 100.0;
- SaturationPressure_mb = 6.11 *
pow(10,(7.5*Temp_c)/(237.7+Temp_c));
- VaporPressure_mb = Humidity *
SaturationPressure_mb / 100.0;
- TempVirtual_k = Temp_k / (1.0 -
(VaporPressure_mb/Baro_mb)*(1.-0.622));
- // D = P/(T*R)
- AirDensity = Baro_pa /
(TempVirtual_k*GasConstant);
- % Std Density =
AirDensity/StdAirDensity*100
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Additional Conversion Factors
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- 1 Centimeter - 0.0328084 foot; 0.393701
inch
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- 1 Circular Mil - 7.853982 x 10 to the
negative seventh square inches; 5.067075 x 10 to
the negative sixth square centimeters
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- 1 Cubic Centimeter - 0.061024 cubic inch;
0.270512 dram (U.S. fluid); 16.230664 minims
(U.S.); 0.999972 milliliter
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- 1 Cubic Foot - 0.803564 bushel (U.S.);
7.480520 gallons (U.S. liquid); 0.028317 cubic
meter; 28.31605 liters
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- 1 Cubic Inch - 16.387064 cubic
centimeters
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- 1 Cubic Meter - 35.314667 cubic feet;
264.17205 gallons (U.S. liquid)
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- 1 Foot - 0.3048 meter
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- 1 Gallon (U.S. liquid) - 0.1336816 cubic
foot; 0.832675 gallon (British); 231 cubic
inches; 0.0037854 cubic meter; 3.785306
liters
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- 1 Grain - 0.06479891 gram
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- 1 Gram - 0.00220462 pound (avoirdupois);
0.035274 ounce (avoirdupois); 15.432358
grains
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- 1 Hectare- 2.471054 acres; 1.07639 x 10 to
the fifth square feet
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- 1 Inch - 2.54 centimeters
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- 1 Kilogram - 2.204623 pounds
(avoirdupois)
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- 1 Kilometer - 0.621371 mile (statute)
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- 1 Liter - 0.264179 gallon (U.S.
liquid);0.0353157 cubic foot; 1.056718 quarts
(U.S. liquid)
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- 1 Meter - 1.093613 yards; 3.280840 feet;
39.37008 inches
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- 1 Mile (statute) - 1.609344 kilometers
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- 1 Ounce (U.S. fluid) - 1.804688 cubic
inches; 29.573730 cubic centimeters
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- 1 Ounce (avoirdupois) - 28.349523 grams
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- 1 Ounce (apothecary or troy) - 31.103486
grams
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- 1 Pint (U.S. liquid) - 0.473163 liter;
473.17647 cubic centimeters
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- 1 Pound (avoirdupois) - 0.453592 kilogram;
453.59237 grams
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- 1 Pound (apothecary or troy) - 0.3732417
kilogram, 373.24172 grams
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- 1 Quart (U.S. dry) - 1.10119 liters
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- 1 Quart (liquid) - 0.946326 liter
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- 1 Radian - 57.295779 degrees
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- 1 Rod - 5.0292 meters
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- 1 Square Centimeter - 0.155000 square
inch
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- 1 Square Foot - 0.09290304 square meter
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- 1 Square Inch - 645.16 square
millimeters
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- 1 Square Meter - 10.763910 square feet
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- 1 Square Yard - 0.836127 square meter
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- 1 Ton (short) - 907.18474 kilograms
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- 1 Yard - 0.9144 meter
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POWER - AC CIRCUITS
- Efficiency = 746 x Output HP / Input
Watts
- 3ø KW = Volts x Amps x PF x 1.732 /
1000
- 3ø Amps = 746 x HP / 1.732 x Eff. x
PF
- 3ø Eff. = 746 x HP / 1.732 x Volts x
Amps x PF
- 3ø PF = Input Watts / Volts x Amps x
1.732
- 1ø KW = Volts x Amps x PF / 1000
- 1ø Amps = 746 x HP / Volts x Eff. x
PF
- 1ø Eff. = 746 x HP / Volts x Amps x
PF
- 1ø PF = Input Watts / Volts x
Amps
- HP (3ø) = Volts x Amps x 1.732 x Eff.
x PF / 746
- HP (1ø) = Volts x Amps x Eff. x PF /
746
- 1 KW = 1000 Watts
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- Eff. = Efficiency, PF = Power Factor, KW =
Kilowatts, HP = Horsepower
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- POWER - DC
CIRCUITS
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- Torque = HP x 5280 /
RPM
- HP = Torque X RPM /
5280
- 1 HP = 36 lb.in. @ 1750
RPM
- 1 HP = 3 lb. ft. @ 1750
RPM
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Eff. = Efficiency, HP = Horsepower
- OHMS LAW
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- Volts (E) = Amps (I) x Ohms
(R)
- Amps (I) = Volts (E) / Ohms
(R)
- Ohms (R) = Volts (E) / Amps
(I)
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R=Ohms, E=Volts, I=Amperes
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- To figure miles per hour, multiply the
engine RPM by the Wheel Diameter in inches and
divide this by the Gear Ratio times 336
- or
- MPH = RPM * wheel diameter (in inches) /
gear ratio * 336
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To figure engine speed (RPM), multiply by the
Speed in MPH, by the rear axle gear ratio times
336. Divide this by the tire diameter in
inches.
or
RPM = MPH * gear ratio * 336 / tire diameter
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