ToolGuyd: In science, imperial units are very rarely used. Acceleration due to gravity? ~9.81 m/s^2. The speed of light? 3 x 10^8 m/s. Speed of sound? 343 m/s at sea level. The wavelength of red? 650 nm.
When it comes to linear measurements, meters are very easy to work with.
1000 meters in a kilometer, 100 centimeters in a meter, 10 millimeters in a centimeter, 1,000,000 nanometers in a millimeter.
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