Q:
# How many inches are in 12 millimeters?

**Twelve millimeters is equal to 0.472 inch.** An inch is defined as exactly 25.4 millimeters by the system of imperial units as well as the system of U.S. customary units.

The word "inch" comes from the Latin word "uncia," which means one-twelfth part. The word "ounce" also originated from the same word. An inch is abbreviated as "in.", and is denoted by either "in." or a double prime. A double prime is approximated by a double quotation mark, which means that 5 inches can be written as 5".

There are 12 inches in a foot, and feet are denoted by a single prime, approximated by an apostrophe. So if a person is 5 feet 6 inches tall, it's written as 5'6". The inch was first defined by the British Weights and Measures Act of 1824, and it was used as a part of a system of units that are known as the imperial system. The imperial system originated from the pre-1824 system known as "English units."

Although the British Weights and Measures Act of 1824 was scheduled to go into effect May 1, 1825, it was not implemented until Jan. 1, 1826. Since 1824, it has been refined and reduced several times.

Learn more about Measurements-
Q:
## How do you convert compression ratio to PSI?

A: To calculate the pounds per square inch (psi) from the compression ratio, one needs the compression ratio and the atmospheric pressure measurement. Then, t... Full Answer >Filed Under: -
Q:
## How is air pressure measured?

A: Air pressure is measured by using a barometer, the value of which is given in varying units, including inches of mercury (in Hg) or millimeters of mercury ... Full Answer >Filed Under: -
Q:
## What is 20 millimeters in inches?

A: Twenty millimeters is the equivalent of 25/32 of an inch or approximately 0.79 inches. One millimeter is about 3/64 of an inch or about 0.039 inches. Twent... Full Answer >Filed Under: -
Q:
## How do you convert 90 centimeters to inches?

A: To convert 90 centimeters to inches, multiply 90 centimeters by the conversion factor of 0.39 centimeters per inch. The conversion equals 35.43 inches, acc... Full Answer >Filed Under: