Definition:Imperial/Length

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Definition

The imperial units of length are as follows:


Mil

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


Inch

\(\displaystyle \) \(\) \(\displaystyle 1\) inch
\(\displaystyle \) \(=\) \(\displaystyle 2 \cdotp 54\) centimetres
\(\displaystyle \) \(=\) \(\displaystyle 0 \cdotp 0254\) 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.

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


Yard

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


Rod, Pole or Perch

\(\displaystyle \) \(\) \(\displaystyle 1\) rod, pole or perch
\(\displaystyle \) \(=\) \(\displaystyle 5 \dfrac 1 2\) yards
\(\displaystyle \) \(=\) \(\displaystyle 502 \cdot 92\) centimetres
\(\displaystyle \) \(=\) \(\displaystyle 5 \cdotp 0292\) metres


Chain

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


Furlong

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


International Mile

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


League

\(\displaystyle \) \(\) \(\displaystyle 1\) league
\(\displaystyle \) \(\) \(\displaystyle 3\) (international) miles
\(\displaystyle \) \(=\) \(\displaystyle 5280\) yards
\(\displaystyle \) \(=\) \(\displaystyle 4828 \cdotp 032\) metres (exactly)