Formula Symbols - D

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

Mathematics Symbols

Mathematics Terms

Formula Symbols - D

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 SymbolDefinitionUSMetricValue
\(Da\) - Damkohler number dimensionless dimensionless -
\(\delta\), \(\;\lambda\) delta , lambda dampening coefficient - - -
\(\zeta\) zeta damping ratio dimensionless dimensionless -
\(f\), \(\;C_f\), \(\;f_d\) - Darcy friction factor dimensionless dimensionless -
\(Da\) - Darcy's law - - -
\(Da\) - Darcy number dimensionless dimensionless -
\(DW\) - Darcy-Weisbach equation dimensionless dimensionless -
\(D\) - Dean number dimensionless dimensionless -
\(De\) - Deborah number dimensionless dimensionless -
\(w_d\) - Debye angular frequency - - -
\(q_d\) - Debye angular wave number - - -
\(\lambda_d\) lambda Debye length - - -
\(\Theta_d\) Theta Debye temperature - - -
\(D\) - Debye-Waller factor - - -
\(\lambda\) lambda decay constant - - -
\(d\) - deceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\) -
\(dB\) - decibel dimensionless dimensionless -
\(d\) - deflection - - -
\(\delta\) delta deformation \(in \;or\; ft\) \(mm \;or\; m\) -
\(x\) - degree of ionization - - -
\(\mu\) mu degree of saturation - - -
\(F\) - degrees of freedom - - -
\(\rho\) rho density \(lb\;/\;ft^3\) \(kg\;/\;m^3\) -
\(\rho\) rho density (aether) constant constant \(9.605125782\;x\;10^{24}\;kg\;/\;m^3\)
\(\rho_f\) rho density (fluid) \(lb\;/\;ft^3\) \(kg\;/\;m^3\) -
\(\rho_v\) rho density (vapor) \(lb\;/\;ft^3\) \(kg\;/\;m^3\) -
\(\rho\) rho density of an ideal gas \(lb\;/\;ft^3\) \(kg\;/\;m^3\) -
\(N_e\), \(\;\rho\) rho density of state - - -
\(z\) - depth \(in \;or\; ft\) \(mm \;or\; m\) -
\(\partial\) partial derivative (rate of change) - - -
\(R^2\) - determination coefficient dimensionless dimensionless -
\(d\) - diameter \(in \;or\; ft\) \(mm \;or\; m\) -
\(\epsilon\) epsilon dielectric constant - \(F\;/\;m\) -
\(P\) - dielectric polarization - - -
\(d\), \(\;\Delta\) delta differential - - -
\(D\), \(\;D_n\), \(\;D_p\) - diffusion coefficient \(lbf\) \(N\) -
\(L_n\), \(\;L_p\) - diffusion length - - -
\(\alpha\) alpha diffusivity \(ft^2\;/\;hr\) \(m^2\;/\;s\) -
\(a\), \(\;b\) - dimension \(in \;or\; ft\) \(mm \;or\; m\) -
\(k_d\) - dimensional constant - - -
\(n\) - dimensionless exponent - - -
\(K\) - dimensionless factor - - -
\(N\) - dimensionless number - - -
\(\mu\), \(\;C_d\) mu discharge coefficient dimensionless dimensionless -
\(d\), \(\;\vec{d}\), \(\;s\), \(\;\delta\) delta displacement \(in \;or\; ft\) \(mm \;or\; m\) -
\( \vec{D}\) - displacement current - - -
\(\psi\), \(\;\delta\) psi, delta dissipation factor - - -
\(E_d\) - dissociation energy - - -
\(d\), \(\;l\), \(\;x\), \(\;y\) - distance \(in \;or\; ft\) \(mm \;or\; m\) -
\(s\) - distance along cable \(in \;or\; ft\) \(mm \;or\; m\) -
\(a\) - distance to lowest cable point \(in \;or\; ft\) \(mm \;or\; m\) -
\(w\) - distributed load \(lbf \;/\; ft\) \(N \;/\; m\) -
\(E_d\) - donor ionization energy - - -
\(K_2\) - downstream resistance coefficient dimensionless dimensionless -
\(D\) - draft \(in-wg\) kPa -
\(C_d\) - drag coefficient dimensionless dimensionless -
\(F_d\) - drag force \(lbf\) \(N\) -
\(v_{dr}\) - drift velocity - - -
\(\zeta\) zeta dryness fraction - - -
\(T_d\) - dewpoint temperature \(F\) \(C\) -
\(Du\) - Dukhin number dimensionless dimensionless -
\(Q\), \(\;q\) - dynamic pressure \(lb\;/\;in^2 \;or\; psi\) \(Pa\) -
\(a\) - dynamic speed constant \(ft \;/\; min\) - -
\(\mu\), \(\;\eta\) mu (used in mechanical), eta (used in chemical) dynamic viscosity \(ft-lbf\;/\;ft^2-sec\) \(mPa-s\) -