Definition:Imperial/Length

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Definition

The imperial units of length are as follows:


Mil

\(\ds \) \(\) \(\ds 1\) mil
\(\ds \) \(=\) \(\ds \dfrac 1 {1000}\) inch
\(\ds \) \(=\) \(\ds 25 \cdotp 4\) microns
\(\ds \) \(=\) \(\ds 0 \cdotp 0254\) millimetres
\(\ds \) \(=\) \(\ds 2 \cdotp 54 \times 10^{-5}\) metres


Inch

\(\ds \) \(\) \(\ds 1\) inch
\(\ds \) \(=\) \(\ds 2 \cdotp 54\) centimetres
\(\ds \) \(=\) \(\ds 0 \cdotp 0254\) metres

This definition is exact, and is how the imperial unit of length is defined.


Foot

The foot is the FPS base unit of length.

\(\ds \) \(\) \(\ds 1\) foot
\(\ds \) \(=\) \(\ds 12\) inches
\(\ds \) \(=\) \(\ds 30.48\) centimetres
\(\ds \) \(=\) \(\ds 0 \cdotp 3048\) metres


Yard

\(\ds \) \(\) \(\ds 1\) yard
\(\ds \) \(=\) \(\ds 3\) feet
\(\ds \) \(=\) \(\ds 36\) inches
\(\ds \) \(=\) \(\ds 91 \cdot 44\) centimetres
\(\ds \) \(=\) \(\ds 0 \cdotp 9144\) metres


Rod, Pole or Perch

\(\ds \) \(\) \(\ds 1\) rod, pole or perch
\(\ds \) \(=\) \(\ds 5 \tfrac 1 2\) yards
\(\ds \) \(=\) \(\ds 16 \tfrac 1 2\) feet
\(\ds \) \(=\) \(\ds 502 \cdot 92\) centimetres
\(\ds \) \(=\) \(\ds 5 \cdotp 0292\) metres


Chain

\(\ds \) \(\) \(\ds 1\) chain
\(\ds \) \(=\) \(\ds 4\) rods, poles or perches
\(\ds \) \(=\) \(\ds 22\) yards
\(\ds \) \(=\) \(\ds 66\) feet
\(\ds \) \(=\) \(\ds 20 \cdotp 1168\) metres


Furlong

\(\ds \) \(\) \(\ds 1\) furlong
\(\ds \) \(=\) \(\ds 10\) chains
\(\ds \) \(=\) \(\ds 40\) rods, poles or perches
\(\ds \) \(=\) \(\ds 220\) yards
\(\ds \) \(=\) \(\ds 660\) feet
\(\ds \) \(=\) \(\ds 201 \cdotp 168\) metres


International Mile

\(\ds \) \(\) \(\ds 1\) (international) mile
\(\ds \) \(=\) \(\ds 8\) furlongs
\(\ds \) \(=\) \(\ds 80\) chains
\(\ds \) \(=\) \(\ds 320\) rods, poles or perches
\(\ds \) \(=\) \(\ds 1760\) yards
\(\ds \) \(=\) \(\ds 1609 \cdotp 344\) metres (exactly)


League

\(\ds \) \(\) \(\ds 1\) league
\(\ds \) \(\) \(\ds 3\) (international) miles
\(\ds \) \(=\) \(\ds 5280\) yards
\(\ds \) \(\approx\) \(\ds 2\) leuca
\(\ds \) \(\approx\) \(\ds 3000\) paces
\(\ds \) \(=\) \(\ds 4828 \cdotp 032\) metres (exactly)