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2. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   The Abel Prize, instituted in 2002 [219] and first awarded in 2003 [220] The Chern Medal for lifetime achievement, introduced in 2009 [221] and first awarded in 2010 [222] The AMS Leroy P. Steele Prize, awarded since 1970 [223] The Wolf Prize in Mathematics, also for lifetime achievement, [224] instituted in 1978 [225]

3. Tree measurement - Wikipedia

   en.wikipedia.org/wiki/Tree_measurement

   Tree height is the vertical distance between the base of the tree and the highest sprig at the top of the tree. The base of the tree is measured for both height and girth as being the elevation at which the pith of the tree intersects the ground surface beneath, or "where the acorn sprouted."

4. Cave survey - Wikipedia

   en.wikipedia.org/wiki/Cave_survey

   A cave survey is a map of all or part of a cave system, which may be produced to meet differing standards of accuracy depending on the cave conditions and equipment available underground. Cave surveying and cartography, i.e. the creation of an accurate, detailed map, is one of the most common technical activities undertaken within a cave and is ...

5. Mount Everest - Wikipedia

   en.wikipedia.org/wiki/Mount_Everest

   On 9 October 2005, after several months of measurement and calculation, the Chinese Academy of Sciences and State Bureau of Surveying and Mapping announced the height of Everest as 8,844.43 m (29,017.16 ft) with accuracy of ±0.21 m (8.3 in), claiming it was the most accurate and precise measurement to date. [41]

6. Length - Wikipedia

   en.wikipedia.org/wiki/Length

   Length is commonly understood to mean the most extended dimension of a fixed object. [1] However, this is not always the case and may depend on the position the object is in. Various terms for the length of a fixed object are used, and these include height, which is vertical length or vertical extent, width, breadth, and depth.

7. International System of Units - Wikipedia

   en.wikipedia.org/wiki/International_System_of_Units

   For example, 1 m/s = 1 m / (1 s) is the coherent derived unit for velocity. [1]: 139 With the exception of the kilogram (for which the prefix kilo- is required for a coherent unit), when prefixes are used with the coherent SI units, the resulting units are no longer coherent, because the prefix introduces a numerical factor other than one.