Formula Symbols - A
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Formula Symbols
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A
| Symbol | Greek Symbol | Definition | US | Metric | Value |
|---|---|---|---|---|---|
| \(V_d\) | - | 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 | - | - | - |
| \(t\) | - | age of concrete | days | days | - |
| \(t_o\) | - | age of concrete at loading | days | days | - |
| \(t_c\) | age of concrete when drying starts at end of moist curing | days | days | - | |
| \(a\) | - | aggregate content of concrete | \(lb\;/\;yd^3\) | \(kg\;/\;m^3\) | - |
| \(A\) | - | air | - | - | - |
| \(\alpha\) | alpha | air content expressed as percentage | % | % | - |
| \(ACR\) | - | 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 | - | - | - |
| \(A\) | - | algebric difference in grade | % | % | - |
| \(F_a\) | - | 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 |
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