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1 league (league) = 1.9008E+11 microinch (µin). League (league) is a unit of Length used in Standard system. Microinch (µin) is a unit of Length used in Standard system.

League: A Unit of Length

The league is an old unit of length that was common in Europe and Latin America, but is no longer official in any nation. It was derived from an ancient Celtic unit and adopted by the Romans. It was the distance a person or a horse could walk in about one hour, usually about 3 to 5 kilometers. The league varied in length from 2.4 to 4.6 statute miles in different regions.

In this article, we will explore the definition, history, usage and conversion of the league as a unit of length.

Definition of the League

The league is a unit of length that is equal to 3 miles or 4.8 kilometers in the English-speaking countries. However, the word league often refers to the Spanish, Portuguese or French league, which have different values.

The Spanish league was originally defined as 5,000 varas (a Spanish yard), about 2.6 miles or 4.2 kilometers. The Portuguese league was also 5,000 varas, but the vara was slightly longer, making the league about 2.7 miles or 4.4 kilometers. The French league was based on the nautical mile and was equal to 3 nautical miles or 5.6 kilometers.

The league is not a standard unit and has no symbol.

History of the League

The origin of the league as a unit of length can be traced back to ancient times, when it was used as a measure of distance based on the human or animal pace. The word league comes from the Latin word leuga, which was derived from the Celtic word leuca. It referred to the distance that could be covered by a person or a horse in one hour.

The league was used by the Romans, who defined it as one and a half Roman miles (7,500 Roman feet or 2.2 kilometers). The Roman league was also called leuga Gallica (the Gaulish league) or leuga Germanica (the Germanic league), depending on the region.

The league was adopted by other countries that followed the Roman system of measurement, such as Spain, Portugal and France. It varied in length from country to country and from time to time, depending on local standards and methods of measurement.

The league was abolished by Philip II of Spain in 1568, but it continued to be used unofficially in some parts of Latin America. The league was also incorporated into the imperial system of measurement, which was established by an act of Parliament in 1824. The imperial system was based on seven base units that could be derived from natural and traditional units. The league remained as a derived unit in the imperial system, but it was no longer recommended for use in scientific and technical fields.

Usage of the League

The league is a unit of length that is used for measuring long distances and dimensions, such as the length of a road or the circumference of a lake.

The league is rarely used in modern times, except for historical or literary purposes. However, some countries still use it for some specific applications.

For example:

• In Argentina, a league is equal to 5 kilometers and is used for measuring land area.
• In Brazil, a league is equal to 6 kilometers and is used for measuring distances on roads and highways.
• In Mexico, a league is variable and depends on the terrain and the mode of transportation. It is used for measuring distances between towns and villages.
• In France, a league is equal to 4 kilometers and is used for measuring distances on maps and signs.
• In Spain, a league is equal to 4 kilometers and is used for measuring distances on roads and highways.

Example Conversions of League to Other Units

The league can be converted to other units of length by using different factors and formulas. Here are some examples of conversion for different types of leagues:

• To convert an English league to miles, multiply by 3:

1 English league x 3 = 3 miles

• To convert an English league to kilometers, multiply by 4.8:

1 English league x 4.8 = 4.8 kilometers

• To convert a Spanish league to miles, multiply by 2.6:

1 Spanish league x 2.6 = 2.6 miles

• To convert a Spanish league to kilometers, multiply by 4.2:

1 Spanish league x 4.2 = 4.2 kilometers

• To convert a Portuguese league to miles, multiply by 2.7:

1 Portuguese league x 2.7 = 2.7 miles

• To convert a Portuguese league to kilometers, multiply by 4.4:

1 Portuguese league x 4.4 = 4.4 kilometers

• To convert a French league to miles, multiply by 3.5:

1 French league x 3.5 = 3.5 miles

• To convert a French league to kilometers, multiply by 5.6:

1 French league x 5.6 = 5.6 kilometers

• To convert a mile to leagues, divide by the appropriate factor:

1 mile / 3 = 0.333 English leagues

1 mile / 2.6 = 0.385 Spanish leagues

1 mile / 2.7 = 0.370 Portuguese leagues

1 mile / 3.5 = 0.286 French leagues

• To convert a kilometer to leagues, divide by the appropriate factor:

1 kilometer / 4.8 = 0.208 English leagues

1 kilometer / 4.2 = 0.238 Spanish leagues

1 kilometer / 4.4 = 0.227 Portuguese leagues

1 kilometer / 5.6 = 0.179 French leagues

Microinch: A Unit of Length

The microinch is a unit of length that is equal to one millionth of an inch (0.000001 inch). It is a non-SI unit of measurement that is mainly used in engineering and manufacturing fields. The symbol for microinch is µin or µ". The microinch is also a derived unit in the British imperial and US customary systems of measurement.

The microinch is most commonly used when expressing small distances or dimensions, such as the surface roughness or flatness of materials and parts. The microinch is also used for measuring the wavelength of light and other electromagnetic waves.

In this article, we will explore the definition, history, usage and conversion of the microinch as a unit of length.

Definition of the Microinch

The microinch is a unit of length that is equal to one millionth of an inch (0.000001 inch). It is defined as 25.4 nanometers or 2.54 × 10^-8 meters by international agreement in 1959. One inch is equal to 25.4 millimeters or 0.0254 meter.

The definition of the microinch has changed over time, as different standards and methods of measurement were developed by various countries and organizations. The current definition of the microinch as based on the meter was agreed upon by an international treaty in 1959.

History of the Microinch

The origin of the microinch as a unit of length can be traced back to the early 20th century, when it was introduced by the American Society for Testing and Materials (ASTM) as a standard for measuring surface roughness. Surface roughness is a measure of how smooth or irregular a surface is, which affects its friction, wear and corrosion properties.

The microinch was adopted by other countries and industries that followed the American system of measurement, such as Canada and Japan. It was also incorporated into the ANSI/ASME B46.1 standard for surface texture in 1985.

The microinch was also used by some optical scientists and engineers to measure the wavelength of light and other electromagnetic waves. For example, the visible spectrum of light ranges from about 4,000 to 7,000 microinches.

Usage of the Microinch

The microinch is a unit of length that is used for measuring small distances or dimensions, such as the surface roughness or flatness of materials and parts. For example:

• Measuring the smoothness or roughness of metal surfaces, such as steel, aluminum and copper.
• Measuring the flatness or curvature of glass surfaces, such as lenses, mirrors and windows.
• Measuring the thickness or diameter of thin films, coatings and wires.
• Measuring the accuracy or tolerance of machined parts, such as gears, bearings and shafts.

The microinch is commonly used in engineering and manufacturing fields, especially in precision machining, metrology and quality control. Some examples are:

• Measuring the surface finish of machined parts, such as turned, milled and ground surfaces.
• Measuring the surface profile of textured surfaces, such as honed, lapped and polished surfaces.
• Measuring the surface geometry of complex surfaces, such as grooved, fluted and serrated surfaces.
• Measuring the surface defects of defective surfaces, such as scratches, pits and dents.

The microinch is also used for measuring the wavelength of light and other electromagnetic waves. For example:

• Measuring the color or frequency of visible light, infrared light and ultraviolet light.
• Measuring the polarization or phase of coherent light, such as laser light and holographic light.
• Measuring the interference or diffraction patterns of interfering light, such as interferometric light and diffractive light.

Example Conversions of Microinch to Other Units

The microinch can be converted to other units of length by using different factors and formulas. Here are some examples of conversion for different types of units:

• To convert a microinch to inches, divide by 1,000,000:

1 µin / 1,000,000 = 0.000001 in

• To convert a microinch to feet, divide by 12,000,000:

1 µin / 12,000,000 = 8.333 × 10^^-8 ft

• To convert a microinch to yards, divide by 36,000,000:

1 µin / 36,000,000 = 2.778 × 10^^-8 yd

• To convert a microinch to meters, multiply by 2.54 × 10^^-8:

1 µin x 2.54 × 10^-8 = 2.54 × 10^^-8 m

• To convert a microinch to kilometers, multiply by 2.54 × 10^^-14:

1 µin x 2.54 × 10^-14 = 2.54 × 10^^-14 km

• To convert a microinch to nanometers, multiply by 25.4:

1 µin x 25.4 = 25.4 nm

• To convert an inch to microinches, multiply by 1,000,000:

1 in x 1,000,000 = 1,000,000 µin

• To convert a foot to microinches, multiply by 12,000,000:

1 ft x 12,000,000 = 12,000,000 µin

• To convert a yard to microinches, multiply by 36,000,000:

1 yd x 36,000,000 = 36,000,000 µin

• To convert a meter to microinches, divide by 2.54 × 10^^-8:

1 m / 2.54 × 10^^-8 = 39,370,078.74 µin

• To convert a kilometer to microinches, divide by 2.54 × 10^^-14:

1 km / 2.54 × 10^-14 = 39,370,078,740,157.48 µin

• To convert a nanometer to microinches, divide by 25.4:

1 nm / 25.4 = 0.03937 µin