Conversion of Area units (all)

Rare and Historical Units of Area

While commonly used units of area, such as square feet and square meters, are prevalent today, there are many rare and historical units that have been used in the past. These units provide insight into the various systems of measurement that have been used by different cultures throughout history.

There are approximately one hundred different units of area that have been used throughout history. Some of the more rare and historical units of area include:

• Square cubit: This was a unit of area used in ancient times and was based on the length of a person's forearm. One square cubit is equal to the area of a square with sides that are one cubit in length.
• Jerib: This unit of area is commonly used in the Middle East and is equal to approximately one acre.
• Tsubo: This is a unit of area that is commonly used in Japan and is equal to approximately 36 square feet.
• Dunam: This is a unit of area that is commonly used in the Middle East and is equal to approximately one quarter of an acre.
• Morgen: This is a unit of area that was commonly used in Germany and is equal to approximately one quarter of a hectare.

While these units may not be as widely used today, they provide a glimpse into the diverse history of measurement systems throughout the world.

Development of Common Units of Area

The development of modern units of area began with the ancient Greeks and their concept of a square unit. From there, many different systems of measurement developed around the world. The metric system, which is now the most widely used system of measurement for area, was developed in France during the late 18th century.

Today, common units of area include:

• Square meter (m²)
• Hectare (ha)
• Square kilometer (km²)
• Square mile (mi²)
• Acre (ac)
• Square yard (yd²)
• Square foot (ft²)
• Square inch (in²)

There are approximately one hundred different units of area that have been used throughout history. However, these common units are the most widely used today and are used in a variety of contexts in science, engineering, and mathematics.

Reference & Record Values of Area Units

There are approximately 100 units of area in use around the world, each with their own history and development. Here are some examples of reference and record values for different units of area:

1. Square meter (m²): 1 m² = 10.76 square feet
2. Square kilometer (km²): The largest square kilometer is the Sea of Okhotsk (4.378 million km²)
3. Hectare (ha): The largest hectare measured is in Kansas, USA – 402,000 ha
4. Square mile (mi²): The largest square mile is Greenland (840,000 mi²)
5. Acre (ac): The largest acre is in Iran (140,000 ac)
6. Square yard (yd²): The smallest square yard is at the Whitehall Estate, Scotland (2.1 yd²)
7. Square foot (ft²): The smallest square foot is at Buckingham Palace, England (11 ft²)
8. Square inch (in²): The smallest square inch is a line of sand particles (2.25 in²)
9. Barn (b): The largest barn is in the US (2.44 million b)
10. Are (a): The smallest are is the square root of 4 (4.47 a)
11. Square centimeter (cm²): The smallest square centimeter is the non-intersecting lines on a three-dimensional square (4 cm²)
12. Square millimeter (mm²): The smallest square millimeter is the area of atoms (0.3 mm²)

These reference and record values give us an idea of the range of sizes that can be expressed using different units of area. They are also useful for understanding the context in which different units of area are used, as well as for making comparisons between different areas.