Formula Symbols - D

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

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Formula Symbols

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D

SymbolGreek SymbolDefinitionEnglishMetricSIValue
\(P_{total}\) - Dalton's law \(\large{\frac{lbf}{in^2}}\) \(Pa\) \(kg-m^{-1}-s^{-2}\) -
\(Da\) - Damkohler number dimensionless -
\(\delta\), \(\;\lambda\) delta , lambda dampening coefficient - - - -
\(\zeta\) zeta damping ratio dimensionless -
\(f\), \(\;C_f\), \(\;f_d\) - Darcy friction factor dimensionless -
\(f_d\) - Darcy friction factor - Brkić dimensionless -
\(f_d\) - Darcy friction factor - free surface flow dimensionless -
\(f_d\) - Darcy friction factor - laminar flow dimensionless -
\(v\) - Darcy velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\) \(m-s^{-1}\)  -
\(Da\) - Darcy's law \(\large{\frac{ft^3}{sec}}\) \(\large{\frac{m^3}{s}}\) \(m^3-s^{-1}\)  -
\(Da\) - Darcy number dimensionless -
\(DW\) - Darcy-Weisbach equation dimensionless -
\(D\) - Dean number dimensionless -
\(De\) - Deborah number 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 \(\large{\frac{ft}{sec^2}}\) \(\large{\frac{m}{s^2}}\) \(m-s^{-2}\) -
\(a\) - deceleration rate \(\large{\frac{ft}{sec^2}}\) \(\large{\frac{m}{s^2}}\)  \(m-s^{-2}\) -
\(dB\) - decibel dimensionless -
\(DSD\) - decision sight distance \(ft\) \(m\) \(m\) -
\(d\), \(\; \delta\) delta deflection - - - -
\(\delta\) delta deformation \(ft\) or \(in\) \(m\) or \(mm\) \(m\) or \(mm\)  -
\(x\) - degree of ionization - -   -
\(\mu\), \(\;S\) mu degree of saturation dimensionless -
\(F\) - degrees of freedom - - - -
\(\rho\) rho density \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\rho_a\) rho density of air \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\rho\) rho density (aether) \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) \(9.605125782\;x\;10^{24}\) \(\large{\frac{kg}{m^3}}\)
\(\rho_f\) rho density of fluid \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\rho_o\) rho density of object \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\rho_v\) rho density of vapor \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\rho\) rho density of an ideal gas \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\rho\) rho density of material due to temperature \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(N_e\), \(\;\rho\) rho density of state \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\rho_w\) rho density of water \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(z\) - depth \(ft\) or \(in\) \(m\) or \(mm\)  \(m\) or \(mm\) -
\(\partial\), \(\;d\) partial derivative (rate of change) - - - -
\(R^2\) - determination coefficient dimensionless -
\(T_d\) - dew point temperature \(F\) \(C\) \(x+273.15\;K\) -
\(d\) - diameter \(ft\) or \(in\) \(m\) or \(mm\)  \(m\) or \(mm\) -
\(\beta\) beta diameter ratio dimensionless -
\(\epsilon\) epsilon dielectric constant - \(\large{\frac{F}{m}}\)  \(F-m^{-1}\) -
\(P\) - dielectric polarization - - - -
\(\Delta\) Delta differential - - - -
\(D\) - diffusion coefficient \(\large{\frac{ft^2}{sec}}\) \(\large{\frac{m^2}{s}}\) \(m^2-s^{-1}\) -
\(L_n\), \(\;L_p\) - diffusion length - - - -
\(\alpha\) alpha diffusivity - - - -
\(a\), \(\;b\) - dimension \(ft\) or \(in\) \(m\) or \(mm\) \(m\) or \(mm\) -
\(DA\) - dimensional analysis - - - -
\(k_d\) - dimensional constant - - - -
\(n\) - dimensionless exponent dimensionless -
\(K\) - dimensionless factor dimensionless -
\(N\), \(DN\) - dimensionless number - - - -
\(DC\) - direct current \(I\) \(\large{\frac{C}{s}}\) \(C - s^{-1}\) -
\(sigma\) sigma direct stress \(\large{\frac{lbf}{in^2}}\) \(Pa\) \(kg-m^{-1}-s^{-2}\) -
\(\mu\), \(\;C_d\) mu discharge coefficient dimensionless -
\(d\) - displacement \(ft\) or \(in\) \(m\) or \(mm\) \(m\) or \(mm\) -
\(q\) - discharge velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\)  \(km-s^{-1}\) -
\(P\) - displacement power \(\large{\frac{ft-lbf}{sec}}\) \(W\)  \(kg-m^2-s^{-3}\) -
\(d\) - displacement of piston - \(\large{\frac{cm^3}{rev}}\)  \(cm^3-rev^{-}\) -
\(d\), \(\;l\), \(\;x\), \(\;y\) - distance \(ft\) or \(in\) \(m\) or \(mm\) \(m\) or \(mm\)  -
\(s\) - distance along cable \(ft\) or \(in\) \(m\) or \(mm\)  \(m\) or \(mm\) -
\(U\) - distance between anchore \(in\) \(mm\) \(mm\) -
\(a\) - distance to lowest cable point \(ft\) or \(in\) \(m\) or \(mm\) \(m\) or \(mm\) -
\(d_4\) - distance traversed by opposing vehicle \(ft\) \(m\) \(m\)  -
\(d_2\) - distance while passing vehicle occupies left lane \(ft\) \(m\) \(m\) -
\(w\) - distributed load - - - -
\(DF\) - distribution factor dimensionless -
\(f_o\) - doppler effect \(Hz\) \(Hz\)  \(s^{-1}\) -
\(K_2\) - downstream resistance coefficient dimensionless -
\(Y\) - apparent density \(\large{ \frac{lbm}{ft^3} }\) \(\large{ \frac{kg}{m^3} }\) \(kg - m^{-3}\) -
\(C_d\) - drag coefficient dimensionless -
\(F_d\) - drag force \(lbf\) \(N\) \(kg-m-s^{-2}\) -
\(v_{dr}\) - drift velocity - - - -
\(\Delta F_c\) - driving force concentration differential \(lbf\) \(N\) \(kg-m-s^{-2}\) -
\(T\) - dry bulb temperature of moist air - \(K\) \(K\) -
\(\zeta\) zeta dryness fraction - - - -
\(\rho_{db}\) rho dry bulk density of soil \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\) \(kg-m^{-3}\) -
\(\large{ \gamma_d }\) gamma dry unit weight \(\large{ \frac{lbm}{ft^3} }\) \(\large{ \frac{N}{m^3} }\) \(N-m^{-3}\)  
\(Du\) - Dukhin number dimensionless -
\(Q\), \(\;q\) - dynamic pressure \(\large{\frac{lbf}{in^2}}\) \(Pa\) \(kg-m^{-1}-s^{-2}\) -
\(\mu\) mu dynamic shear viscosity \(\large{\frac{lbf-sec}{ft^2}}\) \(Pa-s\) \(kg-m^{-1}-s^{-1}\) -
\(a\) - dynamic speed constant - - - -
\(\mu\), \(\;\eta\) mu (used in mechanical), eta (used in chemical) dynamic viscosity \(\large{\frac{lbf-sec}{ft^2}}\) \(Pa-s \) \(kg-m^{-1}-s^{-1}\) -
\(\mu_w\) mu dynamic viscosity of water \(\large{\frac{lbf-sec}{ft^2}}\) \( Pa-s \) \(kg-m^{-1}-s^{-1}\) -
Symbol Greek Symbol Definition English Metric   Value

 

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