Online length unit conversion tool
As an important part of modern metrology science and technology, length measurement mainly studies geometric quantities that represent the size, length, shape and position of objects. Its basic parameters are length and angle. The unit of length is "meter", and angle is divided into plane angle. and solid angle, whose units are "radians" and "steradians" respectively.
The meter is the basic unit of length in the International System of Units, and its title is m. With the development of science and technology, the physical benchmark for realizing the basic unit has been replaced by the natural benchmark. From 1791, when the French National Congress determined that the "meter" was initially defined in 1997 (the subscript indicates a different year in which the definition was given), the meter was equal to one ten millionth of a quarter of the length of the Earth's meridian, to October 1983. The 17th International Conference on Weights and Measures adopted the current definition of meter 1983 (a meter is the length of a path taken in a vacuum within a time interval of 1/2997294585). It is the progress of science and technology that has brought great development to length measurement. At present, length measurement is mainly based on lasers that can radiate stable wavelengths. The He-Ne laser with methane absorption and stable frequency has the highest wavelength reproduction accuracy. Its wavelength is 3.39mm. In practical applications, it is generally based on the working wavelength standard and end face and Two major categories of physical standards are transmitted: line segments. Among the physical standards for end faces, the most widely used and most accurate is the gauge block. The commonly used gauge block is a rectangular parallelepiped, which has two parallel working surfaces. The gauge block uses its center length to reproduce the measurement value. ,1 The measurement uncertainty of the standard device for calibration of equal gauge blocks reaches (0.02+0.21) μm. The most commonly used line standard is the line ruler. The line ruler reproduces the length by the distance between the engraved lines or the marks on the ruler. The length of the reference line ruler can be measured on the light wave interference ratio meter. my country Self-developed photoelectric light wave length meter. The wavelength of the He-Ne frequency-stabilized laser was used as the standard, and a dynamic photoelectric microscope was used to align the alignment lines of the linear ruler, and the measurement uncertainty reached 0.18mm.
Length unit conversion is a method of length conversion. The unit of length refers to the basic unit for measuring spatial distance. It is the basic unit of measurement established by humans to standardize length.
Commonly used units include millimeters (mm), centimeters (cm), decimeters (dm), kilometers (km), meters (m), micrometers (μm), nanometers (nm), etc.
My country’s traditional unit of length
The traditional units of length in my country include miles, feet, feet, etc.
1 mile = 150 feet = 500 meters
2 miles = 1 kilometer (1000 meters)
1 foot = 10 feet
1 length = 3.33 meters
1 foot = 3.33 decimeters
Length measurement is one of the most commonly measured objects in production practice and is an important part of measurement technology. The main tasks are to research and determine the definition of length units, establish and save length measurement standards, and carry out length verification, calibration and testing. In order to ensure the unity, accuracy and reliability of the measurement value. This article gives a detailed introduction to the main research contents involved in the length measurement research process: length unit, length standard, and error terms that cannot be ignored in length measurement.
International standard unit of length
In the International System of Units, the standard unit of length is "meter", represented by the symbol "m". These length units are all metric.
Imperial unit of length
A few European and American countries, mainly the United Kingdom and the United States, use imperial units, so the length units they use are also different, mainly miles, yards, feet, and inches.
Mile (mile) 1 mile = 1760 yards = 5280 feet = 1.609344 kilometers
Yard (yard, yd) 1 yard = 3 feet = 0.9144 meters
Fathom (f, fath, Fa, ftm) 1 fathom = 2 yards = 1.8288 meters
Wave (furlong) 1 wave = 220 yards = 201.17 meters
Feet (foot, ft, the plural is feet) 1 foot = 12 inches = 30.48 centimeters
Inch (inch, in) 1 inch = 2.54 centimeters
Astronomical unit of length
In astronomy, "light-year" is commonly used as the unit of length. It is the distance traveled by light in a vacuum state in one year, so it is also called a light-year.
1 light year=9.4653×10^12kmLength measurement unit conversion
1 parsec = 3.2616 light years
1 astronomical unit≈149.6 million kilometers
There are two types of length measurement units: metric and imperial. my country's legal units of measurement are based on the International System of Units (metric system). It is composed based on the actual situation of our country, and the imperial units are used in some special occasions in our country. Metric length units are very convenient to use and calculate. Its units include meter (Pm), megameter (Mm), kilometer (km), meter (m), decimeter (dm), centimeter (cm). ), millimeter (mm), silk meter (dmm), millimeter (cmm), micrometer (μm), nanometer (nm), picometer (pm), femtometer (fm), and ammi (am).
1PM(Take rice)=1×10^15m
1Gm(Jingmi/Jimmy)=1×10^9m
1Mm(Trillion meters)=1×10^6m
1km(Km)=1×10^3m
1dm(Shared rice)=1×10^(-1)m
1cm(Centimeter)=1×10^(-2)m
1mm(Mm)=1×10^(-3)m
1dmm(Simi)=1×10^(-4)m
1cmm(Humi)=1×10^(-5)m
1μm(Micron)=1×10^(-6)m
1nm(Nanometer)=1×10^(-9)m
1pm(Pimi)=1×10^(-12)m
1fm(Femto)=1×10^(-15)m
1am(Ami)=1×10^(-18)m