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  2. Balance equation - Wikipedia

    en.wikipedia.org/wiki/Balance_equation

    Global balance. The global balance equations (also known as full balance equations[2]) are a set of equations that characterize the equilibrium distribution (or any stationary distribution) of a Markov chain, when such a distribution exists. For a continuous time Markov chain with state space , transition rate from state to given by and ...

  3. Navier–Stokes equations - Wikipedia

    en.wikipedia.org/wiki/Navier–Stokes_equations

    The Navier–Stokes equations (/ nævˈjeɪ stoʊks / nav-YAY STOHKS) are partial differential equations which describe the motion of viscous fluid substances. They were named after French engineer and physicist Claude-Louis Navier and the Irish physicist and mathematician George Gabriel Stokes. They were developed over several decades of ...

  4. Mass balance - Wikipedia

    en.wikipedia.org/wiki/Mass_balance

    In physics, a mass balance, also called a material balance, is an application of conservation of mass [1] to the analysis of physical systems. By accounting for material entering and leaving a system, mass flows can be identified which might have been unknown, or difficult to measure without this technique. The exact conservation law used in ...

  5. Euler equations (fluid dynamics) - Wikipedia

    en.wikipedia.org/wiki/Euler_equations_(fluid...

    This incompressible flow satisfies the Euler equations. In fluid dynamics, the Euler equations are a set of partial differential equations governing adiabatic and inviscid flow. They are named after Leonhard Euler. In particular, they correspond to the Navier–Stokes equations with zero viscosity and zero thermal conductivity.

  6. Momentum - Wikipedia

    en.wikipedia.org/wiki/Momentum

    These are known as the Navier–Stokes equations. [35] The momentum balance equations can be extended to more general materials, including solids. For each surface with normal in direction i and force in direction j, there is a stress component σ ij. The nine components make up the Cauchy stress tensor σ, which includes both pressure and shear.

  7. Thermochemical equation - Wikipedia

    en.wikipedia.org/wiki/Thermochemical_equation

    Chemical equation showing the transfer of energy to/from outside the system. In thermochemistry, a thermochemical equation is a balanced chemical equation that represents the energy changes from a system to its surroundings. One such equation involves the enthalpy change, which is denoted with Δ H. In variable form, a thermochemical equation ...

  8. What Is Total Daily Energy Expenditure & How Can It Affect ...

    www.aol.com/total-daily-energy-expenditure...

    Katch-McArdle equation. Generally, TDEE calculators estimate BMR based on a person’s height, body weight, age, and sex assigned at birth. Then, they use a physical activity multiplier with the ...

  9. Reynolds-averaged Navier–Stokes equations - Wikipedia

    en.wikipedia.org/wiki/Reynolds-averaged_Navier...

    The Reynolds-averaged Navier–Stokes equations (RANS equations) are time-averaged [a] equations of motion for fluid flow. The idea behind the equations is Reynolds decomposition , whereby an instantaneous quantity is decomposed into its time-averaged and fluctuating quantities, an idea first proposed by Osborne Reynolds . [ 1 ]

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