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  2. Closed system - Wikipedia

    en.wikipedia.org/wiki/Closed_system

    A closed system can be used when conducting chemical experiments where temperature is not a factor (i.e. reaching thermal equilibrium). In engineering. In an engineering context, a closed system is a bound system, i.e. defined, in which every input is known and every resultant is known (or can be known) within a specific time. See also

  3. Federalism - Wikipedia

    en.wikipedia.org/wiki/Federalism

    Federalism is a mode of government that combines a general government (the central or "federal" government) with regional governments ( provincial, state, cantonal, territorial, or other sub-unit governments) in a single political system, dividing the powers between the two. Johannes Althusius is considered the father of modern federalism along ...

  4. Vapor–liquid equilibrium - Wikipedia

    en.wikipedia.org/wiki/Vapor–liquid_equilibrium

    Vapor–liquid equilibrium. In thermodynamics and chemical engineering, the vapor–liquid equilibrium ( VLE) describes the distribution of a chemical species between the vapor phase and a liquid phase . The concentration of a vapor in contact with its liquid, especially at equilibrium, is often expressed in terms of vapor pressure, which will ...

  5. Active protection system - Wikipedia

    en.wikipedia.org/wiki/Active_protection_system

    An active protection system ( APS) is a system designed to actively prevent certain anti-tank weapons from destroying a vehicle. Countermeasures that either conceal the vehicle from, or disrupt the guidance of an incoming guided missile threat are designated soft-kill active protection measures. Countermeasures that physically strike an ...

  6. Photovoltaic system - Wikipedia

    en.wikipedia.org/wiki/Photovoltaic_system

    A photovoltaic system, also called a PV system or solar power system, is an electric power system designed to supply usable solar power by means of photovoltaics.It consists of an arrangement of several components, including solar panels to absorb and convert sunlight into electricity, a solar inverter to convert the output from direct to alternating current, as well as mounting, cabling, and ...

  7. Sign language - Wikipedia

    en.wikipedia.org/wiki/Sign_language

    Sign languages (also known as signed languages) are languages that use the visual-manual modality to convey meaning, instead of spoken words. Sign languages are expressed through manual articulation in combination with non-manual markers. Sign languages are full-fledged natural languages with their own grammar and lexicon. [1]

  8. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    Positional notation (or place-value notation, or positional numeral system) usually denotes the extension to any base of the Hindu–Arabic numeral system (or decimal system ). More generally, a positional system is a numeral system in which the contribution of a digit to the value of a number is the value of the digit multiplied by a factor ...

  9. Decision Review System - Wikipedia

    en.wikipedia.org/wiki/Decision_Review_System

    The Decision Review System ( DRS ), formerly known as the Umpire Decision Review System (UDRS), is a technology-based system used in cricket to assist the match officials in their decision-making. On-field umpires may choose to consult with the third umpire (known as an Umpire Review), and players may request that the third umpire consider a ...