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  2. Pyrgeometer - Wikipedia

    en.wikipedia.org/wiki/Pyrgeometer

    A pyrgeometer is a device that measures near-surface infra-red (IR) radiation, approximately from 4.5 μm to 100 μm on the electromagnetic spectrum (thereby excluding solar radiation). It measures the resistance / voltage changes in a material that is sensitive to the net energy transfer by radiation that occurs between itself and its ...

  3. Pyrometer - Wikipedia

    en.wikipedia.org/wiki/Pyrometer

    The earliest example of a pyrometer thought to be in existence is the Hindley Pyrometer held by the London Science Museum, dating from 1752, produced for the Royal collection. The pyrometer was a well known enough instrument that it was described in some detail by the mathematician Euler in 1760.

  4. Infrared thermometer - Wikipedia

    en.wikipedia.org/wiki/Infrared_thermometer

    A sailor checking the temperature of a ventilation system. Some typical circumstances are where the object to be measured is moving; where the object is surrounded by an electromagnetic field, as in induction heating; where the object is contained in a vacuum or another controlled atmosphere; or in applications where a fast response is required, the accurate surface temperature is desired or ...

  5. Pyrheliometer - Wikipedia

    en.wikipedia.org/wiki/Pyrheliometer

    Pyrheliometer measurement specifications are subject to International Organization for Standardization (ISO) and World Meteorological Organization (WMO) standards. . Comparisons between pyrheliometers for intercalibration are carried out regularly to measure the amount of solar energ

  6. Template:Calculus - Wikipedia

    en.wikipedia.org/wiki/Template:Calculus

    Print/export Download as PDF; ... Template: Calculus is used to ... (you can see an example on the right). Collapsible lists

  7. Great-circle distance - Wikipedia

    en.wikipedia.org/wiki/Great-circle_distance

    A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v are also shown.. The great-circle distance, orthodromic distance, or spherical distance is the distance between two points on a sphere, measured along the great-circle arc between them.

  8. Back-of-the-envelope calculation - Wikipedia

    en.wikipedia.org/wiki/Back-of-the-envelope...

    A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified assumptions.

  9. Pyranometer - Wikipedia

    en.wikipedia.org/wiki/Pyranometer

    A pyranometer (from Greek πῦρ (pyr) 'fire' and ἄνω (ano) 'above, sky') is a type of actinometer used for measuring solar irradiance on a planar surface and it is designed to measure the solar radiation flux density (W/m 2) from the hemisphere above within a wavelength range 0.3 μm to 3 μm.

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