Question 1

What is a ri in Japanese measurement?

Accepted Answer

A ri (里) is a traditional Japanese unit equal to about 3.93 km. 36 cho = 1 ri. Used historically for road distances.

Question 2

How does the Japanese ri differ from the Chinese li?

Accepted Answer

Japanese ri ≈ 3.93 km, Chinese li ≈ 0.5 km. Despite sharing the same character, they are very different lengths.

Question 3

Is this conversion factor exact?

Accepted Answer

Metric-to-metric conversions are exact (1 km = 1000 m). Imperial-to-metric factors like 1 inch = 2.54 cm are exact by international agreement.

Question 4

Why do some countries use different units?

Accepted Answer

Historical reasons - the metric system spread from France after 1795. The US, UK, and a few others retained older systems. Science uses metric worldwide.

ri to km Converter

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