# Who invented inches and feet?

## Inch (length)

Inch is the name of a measure of length. We don't use this unit that much, but the UK, US and Canada measure lengths, distances and distances in inches. Otherwise, the usual measure all over the world is the meter. An inch means an "inch" in English. Quotation marks are used at the top as a symbol for the inch: five inches, for example, is written 5 "for short. An inch is a little longer than two and a half centimeters, exactly: 1" = 2.54 cm.

The inch goes back to the Roman unit of measurement uncia. This Latin word simply means "the twelfth part". A twelfth of the unit of length "foot" was meant here. Therefore, a "foot" is exactly 12 inches, roughly the length of a real foot. Until the 19th century, customs were a common measure of length throughout Europe. Then an attempt was made to uniformly define the many different length measures and an agreement was made on the meter as the basis. This is called the "metric system of units".

We still have customs in many areas. For example, we speak of the folding rule, although the measurements are now in centimeters on it. It used to be a solid stick with graduations in inches. When we buy jeans, the size is often given in inches: the size 30/34 would fit someone with a waist circumference of 30 inches and a leg length of 34 inches. This corresponds to a waist circumference of 75 centimeters and a leg length of 86 centimeters.

The size of the screens of computers, televisions or cell phones is also usually given in inches. It is measured by measuring the diagonal of the screen. For example, many modern smartphones are about 5 "in size. A computer screen, on the other hand, is larger, and a common size would be 17".

The diameters of pipes and hoses for water pipes are also usually given in inches. Smaller inches are often not given with decimal places, but are reduced by dividing by two again and again: there are pipes with 1 "diameter or with 1/2" or 1/4 ". You have to be able to calculate fractions well, so that one can understand that.

The size of screens is usually given by the length of the diagonal in inches.

Vernier caliper or caliper: The lower scale is in centimeters, the upper scale in inches

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