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1 league (league) = 5556000 millimeter (mm). League (league) is a unit of Length used in Standard system. Millimeter (mm) is a unit of Length used in Metric 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

Millimeter: A Unit of Length

Definition of the millimeter

A millimeter is a unit of length in the metric system, which is based on the International System of Units (SI). It is defined as one thousandth of a meter, which is the SI base unit of length. One millimeter can be written as 1 mm or 0.001 m.

How to convert millimeter to other units of length

To convert millimeter to other units of length, we need to use conversion factors that relate the millimeter to the desired unit. For example, to convert millimeter to centimeter, we need to know that 1 cm = 10 mm, so we can divide the number of millimeters by 10 to get the number of centimeters. Similarly, to convert millimeter to inch, we need to know that 1 in = 25.4 mm, so we can divide the number of millimeters by 25.4 to get the number of inches.

Here are some common conversion factors for millimeter and other units of length in the US standard system and the SI system:

• 1 mm = 0.1 cm
• 1 mm = 0.03937 in
• 1 mm = 0.001 m
• 1 mm = 0.000001 km
• 1 mm = 0.00000062137 mi
• 1 mm = 0.00000053996 nmi

Where millimeter is used

The millimeter is a widely used unit of length in many fields and applications around the world. Some examples are:

• In engineering and manufacturing, the millimeter is often used to measure small dimensions and tolerances of parts and products.
• In medicine and biology, the millimeter is often used to measure the size and growth of cells, tissues, organs, and microorganisms.
• In astronomy and physics, the millimeter is often used to measure the wavelength and frequency of electromagnetic radiation, such as radio waves and microwaves.
• In geography and cartography, the millimeter is often used to measure the scale and distance on maps and globes.
• In art and design, the millimeter is often used to measure the thickness and width of lines, shapes, and fonts.

History of millimeter

The millimeter has a long and varied history in different countries and cultures. Some historical facts are:

• The first recorded use of the millimeter as a unit of length was in France in the late 18th century, during the French Revolution. The French Academy of Sciences adopted the metric system as a standard for measurement and defined the meter as one ten-millionth of the distance from the equator to the pole.
• The millimeter was officially recognized as a part of the SI system in 1960, when the General Conference on Weights and Measures (CGPM) adopted a new definition of the meter based on the wavelength of light emitted by a krypton-86 atom.
• The millimeter is still widely used today in many countries that have adopted the metric system, such as most of Europe, Asia, Africa, and Latin America. However, some countries still use other units of length alongside or instead of the millimeter, such as the United States, Canada, and the United Kingdom.

Example conversions of millimeter to other units

Here are some examples of how to convert millimeter to other units of length using the conversion factors given above:

• To convert 5 mm to cm, we divide by 10: 5 mm / 10 = 0.5 cm
• To convert 12 mm to in, we divide by 25.4: 12 mm / 25.4 = 0.47244 in
• To convert 100 mm to m, we divide by 1000: 100 mm / 1000 = 0.1 m
• To convert 250 mm to km, we divide by 1000000: 250 mm / 1000000 = 0.00025 km
• To convert 500 mm to mi, we divide by 1609344: 500 mm / 1609344 = 0.00031069 mi
• To convert 1000 mm to nmi, we divide by 1852000: 1000 mm / 1852000 = 0.00053996 nmi