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Metric Multipliers: The Metric system is based on powers of ten.  
Prefix Yotta Zetta Exa Peta Tera Giga Mega Kilo Hecto Deka  deci centi milli micro nano pico femto atto zepo yocto 
Symbol Y Z E P T G M k h dk  d c m u n p f a z y 
Value Septillion Sextillion Quintillion Quadrillion Trillion Billion Million Thousand Hundred Tens Ones Tenth Hundredth Thousandth Millionth Billionth Trillionth Quadrillionth Quintillionth Sextillionth Septillionth 
Power of 10 10 ^ 24 10 ^ 21 10 ^ 18 10 ^ 15 10 ^ 12 10 ^ 9 10 ^ 6 10 ^ 3 10 ^ 2 10 ^ 1  10 ^ 1 10 ^ 2 10 ^ 3 10 ^ 6 10 ^ 9 10 ^ 12 10 ^ 15 10 ^ 18 10 ^ 21 10 ^ 24 
Example: If you had a device holding a BILLION Bytes, the proper prefix 
Measurement System Terms: There are 4 systems for measurements, each with its own terms.  
Metric System  MKS units. 

MKS = 
Meter, Kilogram, Second 
Metric System  CGS units. 

CGS = 
Centimeter, Gram, Second 
English System  FPS units. 

FPS = 
Foot, Pound, Second 
International System of Units  SI units. 

SI = 
Meter, Kilogram, Second, Ampere, Kelvin, Mole, and Candela 
The seven SI base units are length, mass, time, electric current, temperature, amount of substance (mole), and luminous intensity. The mole is a dimensionless chemical unit that cannot be measured directly; the others are directly measurable. 
The Standards of the Various Systems Compared:  
Length (l) Area (A) Volume (v) Capacity (v) Mass (m) Force (Weight) (F) Time (t) 
MKS meter (m) square meter (m^2) cubic meter (m^3) liter (l) kilogram (kg) newton (nt) second (sec) 
CGS centimeter (cm) square centimeter (cm^2) cubic centimeter (cm^3) milliliter (ml) gram (g) dyne second (sec) 
FPS foot (ft) square foot (ft^2) cubic foot (ft^3) quart (qt) slug pound second (sec) 
A slug is a mass requiring 32 lbs. to lift 
Force Terms:  
Force (Acceleration or the Tendency to Produce Motion)  
MKS units 

1 newton = 
1 kilogram moved 1 m./sec./sec. 
CGS units 

1 dyne = 
1 gram moved 1 cm./sec./sec. 
FPS units 

1 pound = 
the gravational weight of the standard pound
(@ sea level and 45 degrees latitude) 
Notice the Metric systems use a mass to describe force and the English system uses a unit of weight!! (See Standards Compared) 
Work Terms:  
Work = Force X Distance  
MKS units 

1 joule (or newton/meter) = = = = = 
a force of 1 newton moving 1 meter 1 wattsecond 10 million ergs 0.7376 ft./lbs. 9.48 X 10^4 BTU 
CGS units 

1 erg (or 10^7 joule) = 
a force of 1 dyne moving 1 cm. 
FPS units 

1 foot/pound = 
a force of 1 pound moving 1 ft. 
Power Terms:  
Power = Force X Distance / Time  
MKS units 

1 watt = 
1 joule per second 
CGS units 

(no name!) = 
1 erg per second 
FPS units 

(no name!) = 1 horsepower (hp.) = 
1 foot/pound per second 746 Watts 
Light Terminology  
Radiometry: optical measurements of light, regardless of wavelength or color. Photometry: visible light measurements, using the spectral response of the human eye. 

Definition  Radiometric  Photometric  
Name  Unit (SI)  Name  Unit (SI)  
Energy  Radiant Energy  joule  Luminous Energy  lumen / sec 
Energy per unit time = power = flux  Radiant Flux  watt  Luminous Flux  lumen 
Power input per unit area  Irradiance  watt / sq. m.  Illuminance  lumen / sq m. or lux 
Power per unit area  Radiance  watt / sq. m.  Luminous Intensity  sq. lumen 
Power per unit solid angle  Radiant Intensity  watt / sq. m.  Luminous Intensity  candela 
Power per unit solid angle per unit projected  Radiance  watt / sq. m. or steradian  Luminance  candela / sq. m. 
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Copyright © 2003 Tom Scogin Norcross, GA. All rights reserved. 