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Shaku (unit)

language culture Maturity 11-13 Next article →

A shaku is a way to measure length in Japan. It comes from an old unit used in China. Long ago, the length was based on a human hand. It was the space from a thumb to a finger.

In the past, the size of a shaku changed often. It could change based on where you lived. It could even change based on how you used it. One type was for measuring cloth. People called this the baleen shaku. They used whale whiskers as rulers for cloth.

Today, the size is set by law. One shaku is about 30 centimeters. It is equal to 10 sun, which are smaller units.

People still use the shaku for many things. Carpenters use it to work with wood. It is also used to make kimono, which are traditional clothes. A bamboo flute called the shakuhachi gets its name from this unit. The name means the flute is one shaku and eight sun long.

Other places use this unit too. The modern Taiwanese foot is based on the shaku. In 1909, the Korean Empire used the same size. It is a very important way to measure the world.

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