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In atmospheric, earth, and planetary sciences, a scale height, usually denoted by the capital letter H, is a distance (vertical or radial) over which a physical quantity decreases by a factor of e (the base of natural logarithms, approximately 2.718).
Alexandr Wang (Chinese: 汪滔; pinyin: Wāng tāo; [2] born 1997) is the founder and CEO of Scale AI, a data annotation platform that provides training data for machine learning models. [3] [4] At age 24 in 2021, he became the youngest self-made billionaire in the world. [5] [6] [7] Forbes estimated his net worth at $2 billion as of February 2025.
The increase in altitude necessary for P or ρ to drop to 1/e of its initial value is called the scale height: H = R T M g 0 {\displaystyle H={\frac {RT}{Mg_{0}}}} where R is the ideal gas constant, T is temperature, M is average molecular weight, and g 0 is the gravitational acceleration at the planet's surface.
Below are two tables which report the average adult human height by country or geographical region. With regard to the first table , original studies and sources should be consulted for details on methodology and the exact populations measured, surveyed, or considered.
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Length scale (or "scale length"), a significant concept in physics used to define the order of magnitude of a system; Scale height (or "scale length"), a specific parameter in physics denoting the distance over which a quantity decreases by a factor of e; Scale length (string instruments), a measurement of the length of a musical instrument string
Graphical scale bar in combination with a scale expressed as a ratio and a conversion help. The scale ratio of a model represents the proportional ratio of a linear dimension of the model to the same feature of the original. Examples include a 3-dimensional scale model of a building or the scale drawings of the elevations or plans of a building ...
Height measurement using a stadiometer. Human height or stature is the distance from the bottom of the feet to the top of the head in a human body, standing erect.It is measured using a stadiometer, [1] in centimetres when using the metric system or SI system, [2] [3] or feet and inches when using United States customary units or the imperial system.