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The Burj Khalifa [a] (known as the Burj Dubai prior to its inauguration) is a skyscraper in Dubai, United Arab Emirates.It is the world's tallest structure.With a total height of 829.8 m (2,722 ft, or just over half a mile) and a roof height (excluding antenna, but including a 242.6 m spire) [2] of 828 m (2,717 ft), the Burj Khalifa has been the tallest structure and building in the world ...
The nanometre ( SI symbol: nm) is a unit of length in the metric system equal to 10−9 metres ( 1 1 000 000 000 m = 0.000 000 001 m ). To help compare different orders of magnitude, this section lists lengths between 10 −9 and 10 −8 m (1 nm and 10 nm). 1 nm – diameter of a carbon nanotube.
There are 14 mountains over 8,000 metres (26,247 ft), which are often referred to as the Eight-thousanders. (Some people have claimed there are six more 8,000m peaks in Nepal, making for a total of 20. [1])
[2] [4] Elsewhere in the world it is measured at a height of 1.3 meters, [19] 1.4 meters, [5] [20] or 1.5 meters. [ 21 ] Tree girth measurement is commonly performed by wrapping a tape around the trunk at the correct height.
The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1 299 792 458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
There are at least 108 mountains on Earth with elevations of 7,200 m (23,600 ft; 4.5 mi) or greater above sea level. Of these, 14 are more than 8,000 m (26,000 ft; 5.0 mi). [1] The vast majority of these mountains are located on the edge of the Indian and Eurasian plates in China, India, Nepal, and Pakistan.
The Washington Monument is a hollow Egyptian -style stone obelisk with a 500-foot-tall (152.4 m) column surmounted by a 55-foot-tall (16.8 m) pyramidion. Its walls are 15 feet (4.6 m) thick at its base and 11⁄2 feet (0.46 m) thick at their top.
This list of supertall structures is a third part of the List of tallest structures in the world.It contains past or present structures of any type, at least 300 metres (984 ft) tall, but lower than 400 metres (1,312 ft).