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  2. Electrical equipment in hazardous areas - Wikipedia

    en.wikipedia.org/wiki/Electrical_equipment_in...

    Zone 1 classified location An area where ignitable concentrations of flammable gases, vapors or liquids are likely to exist under normal operating conditions. As a guide for Zone 1, this can be defined as 10–1000 hours per year or 0.1–10% of the time. [3] Class I, Division 2 or Zone 2 classified locations

  3. Steinhart–Hart equation - Wikipedia

    en.wikipedia.org/wiki/Steinhart–Hart_equation

    The Steinhart–Hart equation is a model relating the varying electrical resistance of a semiconductor to its varying temperatures. The equation is. where. T {\displaystyle T} is the temperature (in kelvins ), R {\displaystyle R} is the resistance at. T {\displaystyle T} (in ohms),

  4. Thermal transmittance - Wikipedia

    en.wikipedia.org/wiki/Thermal_transmittance

    Thermal transmittance. Thermal transmittance is the rate of transfer of heat through matter. The thermal transmittance of a material (such as insulation or concrete) or an assembly (such as a wall or window) is expressed as a U-value. The thermal insulance of a structure is the reciprocal of its thermal transmittance.

  5. Debye model - Wikipedia

    en.wikipedia.org/wiki/Debye_model

    In thermodynamics and solid-state physics, the Debye model is a method developed by Peter Debye in 1912 to estimate phonon contribution to the specific heat ( heat capacity) in a solid. [ 2] It treats the vibrations of the atomic lattice (heat) as phonons in a box in contrast to the Einstein photoelectron model, which treats the solid as many ...

  6. Technical support - Wikipedia

    en.wikipedia.org/wiki/Technical_support

    Technical support, also known as tech support, is a call centre type customer service provided by companies to advise and assist registered users with issues concerning their technical products. [ 1] Traditionally done on the phone, technical support can now be conducted online or through chat. At present, most large and mid-size companies have ...

  7. Equipment codes - Wikipedia

    en.wikipedia.org/wiki/Equipment_codes

    An equipment code describes the communication (COM), navigation (NAV), approach aids and surveillance transponder equipment on board an aircraft. These alphabetic codes are used on FAA and ICAO flight plan forms to aid Flight service station (FSS) personnel in their handling of aircraft. On the FAA domestic flight plan form (FAA Form 7233-1 ...

  8. Highest temperature recorded on Earth - Wikipedia

    en.wikipedia.org/wiki/Highest_temperature...

    The current official highest registered air temperature on Earth is 56.7 °C (134.1 °F), recorded on 10 July 1913 at Furnace Creek Ranch, in Death Valley in the United States. [ 1] For few years, a former record that was measured in Libya had been in place, until it was decertified in 2012 based on evidence that it was an erroneous reading.

  9. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Zone 8 uses four 2-digit codes (81, 82, 84, 86) and four sets of 3-digit codes (80x, 85x, 87x, 88x) to serve East Asia, South Asia and special services. 83x and 89x are unallocated. Zone 9 uses seven 2-digit codes (90–95, 98) and three sets of 3-digit codes (96x, 97x, 99x) to serve the Middle East , West Asia , Central Asia , parts of South ...

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