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  2. Air lock - Wikipedia

    en.wikipedia.org/wiki/Air_lock

    Air lock. An air lock is a restriction of, or complete stoppage of liquid flow caused by vapour trapped in a high point of a liquid -filled pipe system. The gas, being less dense than the liquid, rises to any high points. This phenomenon is known as vapor lock, or air lock. Flushing the system with high flow or pressures can help move the gas ...

  3. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Missing baryon problem (1998 [117] –2017): proclaimed solved in October 2017, with the missing baryons located in hot intergalactic gas. [118] [119] Long-duration gamma-ray bursts (1993 [114] –2003): Long-duration bursts are associated with the deaths of massive stars in a specific kind of supernova-like event commonly referred to as a ...

  4. Three utilities problem - Wikipedia

    en.wikipedia.org/wiki/Three_utilities_problem

    Two views of the utility graph, also known as the Thomsen graph or. The classical mathematical puzzle known as the three utilities problem or sometimes water, gas and electricity asks for non-crossing connections to be drawn between three houses and three utility companies in the plane. When posing it in the early 20th century, Henry Dudeney ...

  5. Hydronics - Wikipedia

    en.wikipedia.org/wiki/Hydronics

    Hydronics. Hydronics (from Ancient Greek hydro- 'water') is the use of liquid water or gaseous water ( steam) or a water solution (usually glycol with water) as a heat-transfer medium in heating and cooling systems. [ 1][ 2] The name differentiates such systems from oil and refrigerant systems. Historically, in large-scale commercial buildings ...

  6. Hypocaust - Wikipedia

    en.wikipedia.org/wiki/Hypocaust

    Hypocaust. A hypocaust ( Latin: hypocaustum) is a system of central heating in a building that produces and circulates hot air below the floor of a room, and may also warm the walls with a series of pipes through which the hot air passes. This air can warm the upper floors as well. [1] The word derives from the Ancient Greek hypo meaning "under ...

  7. Exact solutions of classical central-force problems - Wikipedia

    en.wikipedia.org/wiki/Exact_solutions_of...

    In the classical central-force problem of classical mechanics, some potential energy functions () produce motions or orbits that can be expressed in terms of well-known functions, such as the trigonometric functions and elliptic functions. This article describes these functions and the corresponding solutions for the orbits.

  8. Forced convection - Wikipedia

    en.wikipedia.org/wiki/Forced_convection

    This mechanism is found very commonly in everyday life, including central heating, air conditioning, steam turbines, and in many other machines.Forced convection is often encountered by engineers designing or analyzing heat exchangers, pipe flow, and flow over a plate at a different temperature than the stream (the case of a shuttle wing during re-entry, for example).

  9. Heat equation - Wikipedia

    en.wikipedia.org/wiki/Heat_equation

    Heat equation. Animated plot of the evolution of the temperature in a square metal plate as predicted by the heat equation. The height and redness indicate the temperature at each point. The initial state has a uniformly hot hoof-shaped region (red) surrounded by uniformly cold region (yellow). As time passes the heat diffuses into the cold region.

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