The inch equals 2.54 centimeters exactly since 1959. It is the global standard for screen diagonal sizes โ a "55-inch TV" has a 139.7 cm diagonal. Pipe diameters, US and UK shoe sizes, and hard-drive form factors are all specified in inches. 1 inch = 1/12 foot = 1/36 yard.
Real-world: A 65-inch TV has a 165 cm diagonal. A smartphone screen is typically 6โ7 inches. Standard copper plumbing in the UK is ยฝ inch or ยพ inch.
Read full inch reference โThe furlong equals 201.168 meters or 1/8 of a statute mile. It originated as the length of a medieval English plough furrow โ "furrow long". Today it survives mainly in horse racing in the UK, Ireland and North America, where race distances are typically 5 to 12 furlongs.
Real-world: The Epsom Derby is run over 1 mile and 4 furlongs (about 2.4 km). The Kentucky Derby is 10 furlongs.
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