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Formula Symbols - A

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

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  • 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

 

A

SymbolGreek SymbolDefinitionUSMetricValue
\(V_d\) - Abbe number dimensionless dimensionless  -
\(\lambda\) lambda absolute activity - -  -
\(p_a\) - absolute pressure \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(\epsilon \) epsilon absolute roughness \(in\) \(mm\)  -
\(T_a\) - absolute temperature \(^\circ F\;or\; ^\circ R\) \( C \;or\; K\)  -
\(R_t\) - absolute thermal resistance \(hr-^\circ F\;/\;Btu\) \(K\;/\;W\) -
\(P_c\) - absolute thermodynamic critical pressure - -  -
\(\mu \) 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 - -  -
\(J\), \(\;S\) - action integral - -  -
\(\gamma\) gamma activity coefficient dimensionless dimensionless  -
\(E_a\) - activation energy \(ft-lbf\) \(J\)  -
\(ACFM\) - actual flow rate \(cfm\) \(L \;/\; s\)  -
\(e\) - actual vapor pressure \(lbf\;/\;ft^2\) \(Pa\)  -
\(l\) - acoustic path length between tranducer faces \(ft\) \(m\)  -
\(p\) - acoustic pressure - -  -
\(t_d\) - accustic signal downstream travel time \(sec\) \(s\)  -
\(t_u\) - accustic signal downstream travel time \(sec\) \(s\)  -
\(A\) - affinity - -  -
\(A\) - air - - -
\(ACR\) - air consumption rate \(SCFM\) \(SCFM\)  -
\(CFM\), \(\;Q_a\) - air flow rate \(ft^3\;/\;min\) \(m^3\;/\;m\)  -
\(Q_a\) - air flow rate through piping \(ft^3\;/\;min\) \(m^3\;/\;m\)  -
\( AFR\) - air-fuel ratio \(lbm\) \(kg\)  -
\( AHP\) - air horsepower \(hp\) -  -
\(T_i\) - air inlet temperature -  -  -
\( m_a\) - air mixture \(lbm\) \(kg\)  -
\(T_o\) - air outlet temperature  - -  -
\(p_l\) - air pressure loss through piping \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(F_a\) - air resistance of drag \(lbf\) \(N\)  -
\(F_a\) - air resistance force \(lbf\) \(N\)  -
\(c_a\) - air specific heat \(Btu\;/\;lb- ^\circ F\) \(kJ\;/\;kg-K\)  -
\(\gamma_a\) gamma air specific weight \(lbf\;/\;ft^3\) \(N\;/\;m^3\)  -
\(v_a\) - air velocity \(ft\;/\;sec\) \(m\;/\;s\) -
\(s\) - AGMA stress number \(lbf\;/\;in^2\) \(Pa\)  -
\(Al\) - Alfven number dimensionless dimensionless  -
\(v_a\) - 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 \(psi \;or\; ksi\) \(kPa \;or\; MPa\)  -
\(S\) - allowable stress \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(ASD\) - allowable stress design - - -
\(S_a\) - allowable stress range \(lb\;/\;in^2 \;or\; psi\) \(Pa\) -
\(F_t\) - allowable tensile stress \(psi \;or\; ksi\) \(kPa \;or\; MPa\)  -
\(A\) - allowance - -  -
\(m_a\) - alpha particle mass constant constant \(6.644\;655\;98\;x\;10^{-27}\;kg\)
\( AC\) - alternating current amp -  -
\(T_a\) - ambient temperature \( F\) \( C\)  -
\(n\), \(\;v^{18}\) - amount of substance - -  -
\( I\) - amp - -  -
\(A\) - ampere - -  -
\(A\) - amplitude \(ft\) \(m\)  -
\(A\) - amplitude \(rad\) \(rad\)  -
\(A_l\) - amplitude (longitudinal) constant constant \(3.662748116\;x\;10^{-19}\;m\)
\(AR\) - amplitude ratio - -  -
\(\beta\) beta Andrade's beta \(hr^{- \frac{1}{3}}\) \(h^{- \frac{1}{3}}\)  -
\(A\), \(\;B\), \(\;C\) - Antoine constant \(inHg\) \(mmHG\)  -
\(A\), \(\;\theta\), \(\;deg\) theta angle \(deg\) \(rad\)  -
\(\phi\) phi angle \(deg\) \(rad\)  -
\(\theta\) theta angle between acoustic path and the pipe's longitudinal axis \(deg\) \(rad\)  -
\(\Delta A\) 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 deflection \(deg\) \(rad\)  -
\(\theta \) theta angular displacement \(deg\) \(rad\)  -
\(\omega\) omega angular frequency \(ft\;/\;sec\) \(rad\;/\;s\)  -
\(H\) - angular impulse - -  -
\(L\) - angular momentum \(lb-ft^2\;/\;sec\) \(kg-m^2\;/\; s\)  -
    angular Planck constant constant constant \(1.054\;571\;726\;x\;10^{-34}\;kg\;m^2\;s^{-1}\)
\(\theta\) theta angular position \(rad\) \(rad\)  -
\(\theta\) theta angular rotation \(rpm\) \(rad\;/\;s\)  -
\(\omega\) omega angular speed \(rpm\) \(rad\;/\;s\)  -
\(\omega\), \(\;v_a\) omega angular velocity \(ft\;/\;sec\) \(rad\;/\;s\)  -
\(d \omega\), \(\;\Delta \omega \) omega angular velocity differential \(ft\;/\;sec\) \(m\;/\;s\)  -
\(k\) - angular wave number - -  -
\(k\) - angular wave vector - -  -
\(a\) - apothem - -  -
\( F_a\) - applied force \(lbf\) \(N\)  -
\(R\) - applied stress \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  
\(Ar\) - Archimedes number dimensionless dimensionless  -
\(E\), \(\;V\) - arc voltage \(volt\) \(volt\)  
\(\overset{\frown}{l}\), \(\; l_a\) - arc length \(in \;or\; ft\) \(mm \;or\; m\) -
\(A\), \(\;S\) - area \(in^2 \;or\; ft^2\) \(mm^2 \;or\; m^2\)  -
\(A\), \(\;A_c\) - area cross-section \(in^2 \;or\; ft^2\) \(mm^2 \;or\; m^2\) -
\(A_{throat}\) - 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 \(ft^2\) \(m^2\)  -
\(\alpha_a\) alpha area thermal expansion coefficient \(ft^2\) \(m^2\)  -
\(Ar\) - Arrhenius number dimensionless dimensionless  -
\(ASD\) - allowable stress design - -  -
\(R\) - aspect ratio - -  -
\(\rho\) rho atmosphere density - -  -
\(p_a\), \(\;p_{atm}\) - atmospheric pressure \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(m_a\) - atomic mass - -  -
\(m_u\) - atomic mass constant constant constant \(1.660\;539\;066\;60\;x\;10^{-27}\;kg\)
\(u\) - atomic mass unit \(lbm\) \(kg\)  -
\(Z\) - atomic number dimensionless dimensionless  -
\(N\) - atomic number density - \(atoms\;/\;cm^3\) -
\(A\) - atomic weight \(lbm\;/\;lbmol\) \(kg\;/\;kmol\)  -
\(A\) - Atwood number dimensionless dimensionless  -
\(Nv\) - Avagadro's number - -  -
\(\Phi\) Phi availability function \(Btu \;/\; lbm\) \(kJ \;/\; kg\)  -
\(\bar {a}\), \(\;a_a\) - average acceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\)  -
\(\bar {\alpha} \) alpha average angular acceleration \(lbf\;/\;ft^2-sec\) \(Pa-s\)  -
\(v_a\), \(\;\bar{\omega}\) omega average angular velocity \(ft\;/\;sec\) \(m\;/\;s\)  -
\(\bar {F}\), \(\;F_a\) - average force \(lbf\) \(N\)  -
\(mw\) - average mole rate - - -
\(\bar {u}\), \(\;v_a\) - average speed \(ft\;/\;sec\) \(m\;/\;s\)  -
\(\sigma_{avg}\) sigma average stress of weld \(lb\;/\;in^2 \;or\; psi\) \(Pa\) -
\(\bar {v}\), \(\;v_a\) - average velocity \(ft\;/\;sec\) \(m\;/\;s\)  -
\(v_a\) - averave axial velocity of water flow \(ft\;/\;sec\) \(m\;/\;s\)  -
\(L\), \(\;N_a\) - Avogadro constant constant constant \(6.022 \;140 \;76 \;x\; 10^{23} mol^{-1}\)
\(D_a\) - axial diffusivity \(ft^2\;/\;min\) \(m^2\;/\;s\)  -
\(P\) - axial force \(lb \;,\; kip\) \(N \;,\; kN\)  -
\(\epsilon_a\), \(\;\epsilon\) epsilon axial strain (longitudinal strain) \(ft\) \(m\)  -
Symbol Greek Symbol Definition US Metric Value

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