enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Pressure-gradient force - Wikipedia

    en.wikipedia.org/wiki/Pressure-gradient_force

    In general, a pressure is a force per unit area across a surface. A difference in pressure across a surface then implies a difference in force, which can result in an acceleration according to Newton's second law of motion, if there is no additional force to balance it. The resulting force is always directed from the region of higher-pressure ...

  3. Stack effect - Wikipedia

    en.wikipedia.org/wiki/Stack_effect

    During the cooling season, the stack effect is reversed, but is typically weaker due to lower temperature differences. [1] In a modern high-rise building with a well-sealed envelope, the stack effect can create significant pressure differences that must be given design consideration and may need to be addressed with mechanical ventilation ...

  4. Lift (force) - Wikipedia

    en.wikipedia.org/wiki/Lift_(force)

    A pressure difference can exist only if something is there for it to push against. In aerodynamic flow, the pressure difference pushes against the air's inertia, as the air is accelerated by the pressure difference. [88] This is why the air's mass is part of the calculation, and why lift depends on air density.

  5. Young–Laplace equation - Wikipedia

    en.wikipedia.org/wiki/Young–Laplace_equation

    In physics, the Young–Laplace equation (/ l ə ˈ p l ɑː s /) is an algebraic equation that describes the capillary pressure difference sustained across the interface between two static fluids, such as water and air, due to the phenomenon of surface tension or wall tension, although use of the latter is only applicable if assuming that the wall is very thin.

  6. Vertical pressure variation - Wikipedia

    en.wikipedia.org/wiki/Vertical_pressure_variation

    A relatively simple version [1] of the vertical fluid pressure variation is simply that the pressure difference between two elevations is the product of elevation change, gravity, and density. The equation is as follows: =, where P is pressure, ρ is density, g is acceleration of gravity, and; h is height.

  7. Laplace pressure - Wikipedia

    en.wikipedia.org/wiki/Laplace_pressure

    The Laplace pressure is the pressure difference between the inside and the outside of a curved surface that forms the boundary between two fluid regions. [1] The pressure difference is caused by the surface tension of the interface between liquid and gas, or between two immiscible liquids.

  8. Magnus effect - Wikipedia

    en.wikipedia.org/wiki/Magnus_effect

    Streamlines are closer spaced immediately above the cylinder than below, so the air flows faster past the upper surface than past the lower surface. Bernoulli’s principle shows that the pressure adjacent to the upper surface is lower than the pressure adjacent to the lower surface. The Magnus force acts vertically upwards on the cylinder. [14]

  9. Pressure gradient - Wikipedia

    en.wikipedia.org/wiki/Pressure_gradient

    Interpreting differences in air pressure between different locations is a fundamental component of many meteorological and climatological disciplines, including weather forecasting. As indicated above, the pressure gradient constitutes one of the main forces acting on the air to make it move as wind.