Six inches equals 20 centimeters.

In China, it is customary to use the municipal length unit, in which 1 foot is equal to 10 inches, and 1 inch is approximately 3.33 centimeters. Therefore, a simple conversion is needed to determine how many centimeters six inches equal. 1 inch≈3.33 cm. Now, let's calculate how many centimeters six inches equal: 6 inches = 6 inches x 3.33 centimeters/inch ≈ 19.98 centimeters. Therefore, according to the conversion relationship of the municipal length unit, six inches is approximately equal to 19.98 centimeters, which can be approximately expressed as 20 centimeters.

This conversion of length units is very common in traditional Chinese measurement, and is still widely used especially in some fields such as handicraft production, textile industry, construction and decoration. However, it should be noted that the International Standard System of Units (SI Units) has become a universal system of weights and measures that uses meters as the unit of length to avoid confusion and misunderstandings between different countries. Therefore, in international communication and science, SI units of length are often used.

The origin of the unit "inch"

Ancient culture and system: The ancient Chinese weights and measures system was formed during the long-term cultural and social development. The unit "inch" is part of the ancient system of weights and measures, which can be traced back to ancient China during the Shang and Zhou dynasties.

Human body size: It is said that the earliest definition of "inch" was based on human body size. The ancient Chinese used the joints of fingers as a standard for length, defining the length of a finger's joint as an "inch".

Length standardization: In order to ensure the consistency and standardization of measurements, ancient China established a series of regulations that linked length units such as "inch" to specific standard items (such as copper rulers) for measurement and trade.

Cultural and scientific applications: The "inch" unit was widely used in architecture, engineering, art, medicine, agriculture and other fields in ancient China. It is not only used to measure length, but also to measure time (hour) and temperature (cold and heat).

Inheritance and evolution: Over time, the system of weights and measures evolved in China, including the definition of the "inch" unit. Although there were some different definitions in ancient times, the "inch" unit has been inherited and used in China to this day.