Formula Symbols - A

Written by Jerry Ratzlaff on . Posted in Nomenclature & Symbols for Engineering, Mathematics, and Science

For other symbols see:  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

SymbolGreek SymbolDefinitionUSMetric
\(V\) - Abbe number dimensionless number dimensionless number
\(\lambda\) lambda absolute activity - -
\(p_a\) - absolute pressure \(lb\;/\;in^2 \;or\; psi\) \(Pa\)
\(\epsilon \) epsilon absolute roughness \(in\) \(mm\)
\(T_a\) - absolute temperature \(^\circ F\;or\; ^\circ R\) \( C \;or\; K\)
\(\mu \) mu absolute viscosity \(lbf\;/\;ft^2-sec\) \(Pa-s\)
\(\alpha\) alpha absorptance - -
\(\alpha\) alpha absorptivity - -
\(a\) - acceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\)
\(g\)   acceleration of free fall \(ft\;/\;sec^2\) \(m\;/\;s^2\)
\(g\) - acceleration of gravity \(ft\;/\;sec^2\) \(m\;/\;s^2\)
\(n_a\) - acceptor number density - -
\(J \;or\; S\) - action integral - -
\(\gamma\) gamma activity coefficient dimensionless number dimensionless number
\(E_a\) - activation energy \(ft-lbf\) \(J\)
\(ACFM\) - actual flow rate \(cfm\) \(L \;/\; s\)
\(e\) - actual vapor pressure \(lbf\;/\;ft^2\) \(Pa\)
\(p\) - acoustic pressure - -
\(A\) - affinity - -
\(ACR\) - air consumption rate \(SCFM\) \(SCFM\)
\( AHP\) - air horsepower \(hp\) -
\(F_a\) - air resistance force - -
\(CFM\) - air flow rate \(ft^3\;/\;min\) \(m^3\;/\;m\)
\( AFR\) - air-fuel ratio \(lbm\) \(kg\)
\( m_a\) - air mixture \(lbm\) \(kg\)
\(s\) - AGMA stress number \(lbf\;/\;in^2\) \(Pa\)
\(Al\) - Alfven number dimensionless number dimensionless number
\(v_a\) - Alfven speed - -
\(F_a\) - allowable axial stress \(psi \;or\; ksi\) \(kPa \;or\; MPa\)
\(F_b\) - allowable bending stress \(psi \;or\; ksi\) \(kPa \;or\; MPa\)
\(F_c\) - allowable compressive stress \(psi \;or\; ksi\) \(kPa \;or\; MPa\)
\(F_v\) - allowable shear stress \(psi \;or\; ksi\) \(kPa \;or\; MPa\)
\(F_t\) - allowable tensile stress \(psi \;or\; ksi\) \(kPa \;or\; MPa\)
\(ASD\) - allowable stress design - -
\(A\) - allowance - -
\( AC\) - Alternating current amp -
\(T_a\) - ambient temperature \( F\) \( C\)
\(n \;or\; v^{18}\) - amount of substance - -
\( I\) - amp - -
\(A\) - ampere - -
\(A\) - amplitude \(ft\) \(m\)
\(A\) - amplitude \(rad\) \(rad\)
\(AR\) - amplitude ratio - -
\(\beta\) beta Andrade's beta \(hr^{- \frac{1}{3}}\) \(h^{- \frac{1}{3}}\)
\(A \;or\; \theta \;or\; deg\) theta angle \(deg\) \(rad\)
\(\phi\) phi angle \(deg\) \(rad\)
\(\theta\) theta angular deflection \(deg\) \(rad\)
\(\Delta A\) delta angle differential \(deg\) \(rad\)
\(\theta\) theta angular rotation \(rpm\) \(rad\;/\;s\)
\(\gamma \) gamma angle of twist \(deg\) \(rad\)
\(\alpha\) alpha angular acceleration \(deg\;/\;sec^2\) \(rad \;/\;s^2\)
\(\theta \) theta angular displacement \(deg\) \(rad\)
\(\omega\) omega angular frequency - -
\(H\) - angular impulse - -
\(L\) - angular momentum \(lb-ft^2\;/\;sec\) \(kg-m^2\;/\; s\)
\(\theta\) theta angular position \(rad\) \(rad\)
\(\theta\) theta angular rotation \(rpm\) \(rad\;/\;s\)
\(\omega\) omega angular speed \(rpm\) \(rad\;/\;s\)
\(\omega \;or\; v_a\) omega angular velocity \(ft\;/\;sec\) \(rad\;/\;s\)
\(d \omega \;or\; \Delta \omega \) omega angular velocity differential \(ft\;/\;sec\) \(m\;/\;s\)
\(k\) - angular wave number - -
\(k\) - angular wave vector - -
\(a\) - apothem - -
\( F_a\) - applied force \(lbf\) \(N\)
\(Ar\) - Archimedes number dimensionless number dimensionless number
\(A \;or\; S\) - area \(in^2 \;or\; ft^2\) \(mm^2 \;or\; m^2\)
\(A_{throat}\) - area cross the throat of a weld \(in^2 \;or\; ft^2\) \(mm^2 \;or\; m^2\)
\(A_d\) - area differential - -
\(f_a\) - area gradient \(ft\) \(m\)
\(\Delta A\)   area thermal expansion \(ft^2\) \(m^2\)
\(Ar\) - Arrhenius number dimensionless number dimensionless number
\(ASD\) - allowable stress design - -
\(R\) - aspect ratio - -
\(p_a \;or\; p_{atm}\) - atmospheric pressure \(lb\;/\;in^2 \;or\; psi\) \(Pa\)
\(m_a\) - atomic mass - -
\(m_u\) - atomic mass constant - -
\(u\) - atomic mass unit \(lbm\) \(kg\)
\(Z\) - atomic number dimensionless number dimensionless number
\(A\) - atomic weight \(lbm\;/\;lbmol\) \(kg\;/\;kmol\)
\(A\) - Atwood number dimensionless number dimensionless number
\(Nv\) - Avagadro's number - -
\(\Phi\) Phi availability function \(Btu \;/\; lbm\) \(kJ \;/\; kg\)
\(\bar {a} \;or\; a_a\) - average acceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\)
\(\bar {\alpha} \) alpha average angular acceleration \(lbf\;/\;ft^2-sec\) \(Pa-s\)
\(v_a \;or\; \bar{\omega}\) omega average angular velocity \(ft\;/\;sec\) \(m\;/\;s\)
\(\bar {F} \;or\; F_a\) - average force \(lbf\) \(N\)
\(\bar {u} \;or\; v_a\) - average speed \(ft\;/\;sec\) \(m\;/\;s\)
\(\bar {v} \;or\; v_a\) - average velocity \(ft\;/\;sec\) \(m\;/\;s\)
\(D_a\) - axial diffusivity \(ft^2\;/\;min\) \(m^2\;/\;s\)