Formula Symbols - A

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

Mathematics Symbols

Mathematics Terms

Formula Symbols - A

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 \(^\circ F\;or\; ^\circ R\) \( C \;or\; K\)
\(P_c\) - 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 - -
\(J \;or\; S\) - 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 \(lbf\;/\;ft^2\) \(Pa\)
\(l\) - 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 - -
\(ACR\) - air consumption rate \(SCFM\) \(SCFM\)
\(CFM\) - 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 \(lbf\) \(N\)
\(v_a\) - air velocity \(ft\;/\;sec\) \(m\;/\;s\)
\(s\) - 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 \(psi \;or\; ksi\) \(kPa \;or\; MPa\)
\(S\) - allowable stress \(lb\;/\;in^2 \;or\; psi\) \(Pa\)
\(F_t\) - 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 \(hr^{- \frac{1}{3}}\) \(h^{- \frac{1}{3}}\)
\(A \;or\; B \;or\; C\) - Antoine constant \(inHg\) \(mmHG\)
\(A \;or\; \theta \;or\; deg\) theta angle \(deg\) \(rad\)
\(\phi\) phi angle \(deg\) \(rad\)
\(\theta\) theta angle between acoustic path and the pipe's longitudinal axis \(deg\) \(rad\)
\(\theta\) 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 \(ft\;/\;sec\) \(rad\;/\;s\)
\(H\) - 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 \(ft^2\) \(m^2\)
\(\alpha_a\) alpha area thermal expansion coefficient \(ft^2\) \(m^2\)
\(Ar\) - 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 \(ft\;/\;sec\) \(m\;/\;s\)
\(v_a\) - averave axial velocity of water flow \(ft\;/\;sec\) \(m\;/\;s\)
\(D_a\) - axial diffusivity \(ft^2\;/\;min\) \(m^2\;/\;s\)
\(\epsilon_a\) epsilon axial strain \(ft\) \(m\)