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Fluid Dynamics Glossary

through Piping - Air Pipe Sizing - Air Pressure Loss through Piping - Air Velocity through Piping - Air–fuel Ratio - The mass ratio of air to fuel mixture present in an internal combustion engines. Because it is a ratio, it is unitless. Amagat's Law -...

Schmidt Number

$dimensionless$ $ \nu $ (Greek symbol nu) = Kinematic Viscosity $ft^2\;/\;sec$ $m^2\;/\;s$ $ D_m $ = Mass Diffusivity $ft^2\;/\;sec$ $m^2\;/\;s$ Schmidt number, abbreviated as Sc, a dimensionless number, is used in fluid mechanics and heat...

Chemical Energy

} } \) Symbol English Metric $ E_c $ = Chemical Energy (Energy Released or Absorbed) $ lbf-ft $ $ J $ $ \Delta m $ = Mass Change $lbm$ $kg$ $ c $ = Speed of Light $ft \;/\; sec$ $m \;/\; s$ Chemical energy, abbreviated as $E_c$, is...

Weight

W \;=\; m \cdot g \) (Weight) $ m \;=\; \dfrac{ W }{ g }$ Symbol English Metric $ W $ = Weight $lbf$ $N$ $ m $ = Mass $lbm$ $kg$ $ g $ = Gravity $ft \;/\; sec^2$ $m \;/\; s^2$ When you think of weight, abbreviated as W or WT, it is...

Molecular Weight

= Specific Gas Constant $ft-lbf \;/\; lbm-R$ $J \;/\; kg-K$ Molecular weight, abbreviated as MW, also called molecular mass, is the mass of a molecule relative to the unified atomic mass unit or the gram per mole. It is a fundamental property of a...

Formula Symbols - R

activity - - - - $g'$ - reduced gravity $\large{\frac{ft}{sec^2}}$ $\large{\frac{m}{s^2}}$ $kg-m-s^{-2}$ - $\mu$ - reduced mass $lbm$ $kg$ $kg$ - $h$ = $\frac{h}{2\;\pi}$ - reduced Plank constant - $J-s$ $kg-m^2-s^{-1}$ $1.054\;571\;817...\;x\;10^{-34}$...

Escape Velocity

2 \cdot G \cdot m }{ v_e^2 }\) Symbol English Metric $ v_e $ = Escape Velocity $ft\;/\;sec$ $m\;/\;s$ $ m $ = Mass of the Planet or Moon $ lbm $ $ kg $ $ r $ = Radius from the Center of Mass (Planet or Moon) to Start Point $ ft $ $ m $...

Newton's Laws of Motion

$ m \;=\; \dfrac{ F }{ a }$ $ a \;=\; \dfrac{ F }{ m }$ Symbol English Metric $ F $ = force $lbf$ $N$ $ m $ = mass $lbm$ $kg$ $ a $ = acceleration $ft\;/\;sec^2$ $m\;/\;s^2$ Newton's laws of motion is one of the Clasical branches...

Lorentz Factor

as $ \gamma $ (Greek symbol gamma), a dimensionless number, is the factor by which time, length, and relativistic mass change for an object while that object is motion. It is a fundamental concept in Einstein's theory of special relativity. It...

Energy Density

Energy Density per Unit Mass Formula $ \rho_e \;=\; \dfrac{ E_t }{ m }$ (Energy Density per Unit Mass) $ E_t \;=\; \rho_e \cdot m $ $ m \;=\; \dfrac{ E_t }{ \rho_e }$ Symbol English Metric $ \rho_e $ (Greek symbol rho) = Energy Density per Unit...

Meter Glossary

and intense localized forces. Coriolis Flow Meter - An advanced flow measurement device designed to directly measure the mass flow rate of a fluid, whether it be a liquid, gas, or slurry. Its operation relies on the Coriolis effect, where the meter's...

Thermodynamics

system ftom the surroundings and can be fixed or movable. Closed System - Exchanges only energy with its surroundings. No mass can cross the system. Isolated System - Keeps the energy and matter within the system and everything else out. No transfer in...

Weight Force

F_g }{ m }\) Symbol English Metric $ W $ = Weight $ lbf $ $\ N $ $ F_g $ = Weight Force $ lbf $ $ N $ $ m $ = Mass $ lbm $ $ kg $ $ g $ = Gravitational Acceleration $ft\;/\;sec^2$ $m\;/\;s^2$ Weight force, also known simply as...

Nuclear Energy

}{ \Delta m } } \) Symbol English Metric $ E_n $ = Nuclear Energy Released $ lbf-ft $ $ J $ $ \Delta m $ = Change in Mass $lbm$ $kg$ $ c $ = Speed of Light $ft \;/\; sec$ $m \;/\; s$ Nuclear energy, abbreviated as $E_n$, is the...

Newton's Second Law

$ m \;=\; \dfrac{ F }{ a }$ $ a \;=\; \dfrac{ F }{ m }$ Symbol English Metric $ F $ = Force $lbf$ $N$ $ m $ = Mass $lbm$ $kg$ $ a $ = Acceleration $ft\;/\;sec^2$ $m\;/\;s^2$ Newton's second law of motion, also known as the Law of...

Wet Bulk Density of Soil

$ \rho_{sat} $ (Greek symbol rho) = Soil Saturated Bulk Density $lbm \;/\; ft^3$ $kg \;/\; m^3$ $ m_l $ = Liquid Mass $lbm$ $kg$ $ m_s $ = Solid Mass $lbm$ $kg$ $ V_t $ = Total Volume of Soil $ft^3$ $m^3$ Wet bulk density of...

Radius of Gyration

$mm^2$ Radius of gyration, abbreviated as K, is a measure used in engineering and physics to describe how the area, mass, or particles of an object are distributed relative to an axis. It represents the distance from the axis at which the entire area...

Speed of Light

Albert Einstein's theory of special relativity, the speed of light is the ultimate speed limit in the universe. Nothing with mass can travel at or exceed the speed of light in a vacuum. As an object with mass approaches the speed of light, its...

Relativity Glossary

A B C A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z Center of Mass - A uniform gravitational field, is a concept in physics that describes the average position of the mass of an object. It is a...

Physics Glossary

path. Angular Momentum - How much an object is rotating around a fixed point. The angular momentun of a body is equal to the mass of the body multiplied by the cross product of the position vector of the particle with its vertical velocity. Astrobiology...

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