What units of length are available abroad? American unit of length

miles, yards, rulers, inches, rulers, inches, etc.

Generally speaking, we only need to memorize the seven base units of the metric system, as well as the decimal carry rule, to get a clear auxiliary unit. For example:

1 km 10 3 m 10 4 dm 10 5 cm 10 6 mm 10 9 μm 10 12 nm, how neat and beautiful, resulting in extreme comfort.

For example, in Chinese, a span, a pinch, refers to the span between the thumb and middle finger. However, there are tall, short, fat and thin people, so the definition of length is also erratic and incorrect.

Notes:

But the imperial unit can cure OCD because miles, yards, feet, inches, etc., all have corresponding weights and measurements, so these length units are not carried around. Thus, there is a strange relationship between 1 mile 1760 yards 5280 feet and 63360 inches.

Worldwide, there are two main systems of units. One is the International System of Units (abbreviated SI, also known as the metric system), which includes seven base units, as well as other derived and auxiliary units. This is the unit system used in China.

Of course, the metric system is the most widely used system in the world.

mile, yard, ruler, inch, to ruler, inch and other imperial length, one foot = 10 inches = 305 mm = meters, at present, basically to the metric length unit but the shadow of the imperial unit is still a lot, such as plywood, stainless steel plate 1220 2440, 1220 3050 and other odd metric sizes, all from 4 feet 8 feet, 4 feet 10 feet and other specifications,

Generally speaking, "rice" or "inch" is used"as a unit of length.

The most commonly used units of length in the United States are inches (inches), feet (feet), and yards (yards). 1 inch = 1 foot, 12 inches is 1 foot, and 36 inches is 1 yard.

The word inch means thumb in Dutch, and an inch is the length of a thumb. Of course, the length of a person's thumb also varies.

In the 14th century, King Edward II promulgated the "Standard Legal Inches". The rule is: The length of the three largest grains of wheat from the middle of the ears of barley and arranging them in a row is one inch, i.e., 1 inch =. This unit is often used for the size of the display screen.

The SI unit of length is "meter" (symbol "m"), and the commonly used units are millidenier meter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micron (m), nanometer (pure nm) and so on.

1960 11th International Conference on Weights and Measures: The length of the meter is equal to the multi-modulus of the wavelength of the radiation in a vacuum equal to the transition between the 2p10 and 5d1 energy levels of the Krypton 86 atom.

In general, "meter" is generally defined as the length of the distance traveled by light in a vacuum over a period of 1 299792458 s. The length unit adopted in China is consistent with the International System of Units, that is, "meter" is used as the legal unit of length measurement in China.

What are the internationally used length units: the traditional Chinese length units are rational, zhang, ruler, inch, xun, yi, fu, yi, step, step, chang, arrow, feast, several, rail, pheasant, milli, centi, minute, etc.

The basic conversion relationship is as follows:

1 zhang = 10 feet, 1 foot = 10 inches, 1 inch = 10 points; 1 point = 10 cents.

1 zhang meter, 1 foot decimeter; 1 inch cm.

1 kilometer (km) = 1000 meters, 1 meter (m) = 100 cm; 1 centimeter (cm) = 10 mm.

1 li = 150 zhang = 500 meters, 2 li = 1 kilometer (1000 meters).

Millimeters, centimeters, decimeters, meters, kilometers" are all commonly used units of length, and they are marked in English units as:

1. "mm" is represented by English letters: mm;

2. "Centimeter" is represented by English letters: cm;

3. "Decimeter" is expressed in English letters as: DM;

4. "M" is represented by English letters: m;

5. "Kilometer" Lasong is represented by English letters: km.

The unit of length is SI Wild Pants: Mi Song Shou Jane (symbol "m").

The unit of length refers to the basic unit of measuring the distance in space, and it is the basic unit formulated by human beings in order to standardize the length. Its SI unit is "meter" (symbol "m"), and the commonly used units are millimeters (mm), centimeters (cm), decimeters (dm), kilometers (km), meters (m), micrometers (m), nanometers (nm), and so on. Units of length play an important role in various fields.

The traditional Chinese units of length include li, zhang, ruler, inch, xun, yi, fu, yi, step, step, chang, arrow, feast, several, rail, pheasant, milli, centi, minute, etc.

In the International System of Units, the standard unit of length is the meter, which is denoted by the symbol "m". 1960 11th International Conference on Weights and Measures: "The length of the celery meter is equal to the wavelength of the radiation in a vacuum of the transition between the 2p10 and 5d1 levels of the Krypton-86 atom".

In addition, in practice, the Eggstrand (abbreviated as Angstrand, symbol; is a unit of length. It is not an SI unit, but it is convertible to an SI unit, i.e. 1 = 10 (-10) meters = nanometers. It is generally used for atomic radius, bond length, and wavelength of visible light.