Formula Symbols - E
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E
| Symbol | Greek Symbol | Definition | US | Metric | Value |
|---|---|---|---|---|---|
| earth age | constant | constant | \(1.4327\;x\;10^{17}\;s\) | ||
| earth axial tilt | constant | constant | \(0.407\;638\;19\;rad\) | ||
| earth average lunar month | constant | constant | \(2.551\;4430\;x\;10^6\;s\) | ||
| earth core radius | constant | constant | \(3.485\;x\;10^6\;m\) | ||
| earth dry land surface area | constant | constant | \(1.489\;40\;x\;10^{14}\;m^2\) | ||
| earth equatorial surface gravity | constant | constant | \(9.780\;327\;m\;s^{-2}\) | ||
| earth equatorial radius | constant | constant | \(6.3781\;x\;10^6\;m\) | ||
| earth equatorial rotation speed | constant | constant | \(465.1\;m\;s^{-1}\) | ||
| earth escape velocity | constant | constant | \(1.1186\;x\;10^4\;m\;s^{-1}\) | ||
| earth mass | constant | constant | \(5.9736\;x\;10^{24}\;kg\) | ||
| \(g\) | earth mean density | constant | constant | \(5.515\;x\;10^3\;kg\;m^{-3}\) | |
| earth mean surface pressure | constant | constant | \(1.103\;25\;10^5\;kg\;m^{-1}\;s^{-2}\) | ||
| earth mean radius | constant | constant | \(6.3710\;x\;10^6\;m\) | ||
| earth mean surface temperature | constant | constant | \(287.2\;K\) | ||
| earth molar mass constant | constant | constant | \(0.001\;kg\;mol^{-1}\) | ||
| earth polar radius | constant | constant | \(6.3568\;x\;10^6\;m\) | ||
| earth surface area | constant | constant | \(5.100\;720\;x\;10^{14}\;m^2\) | ||
| earth volume | constant | constant | \(1.083\;21\;x\;10^{21}\;m^3\) | ||
| \(e\) | - | eccentricity | in | mm | - |
| \(Ec\) | - | Eckert number | dimensionless | dimensionless | - |
| \(I\) | - | effective line current | \(A\) | \(A\) | - |
| \(V\) | - | effective line voltage | \(V\) | \(V\) | - |
| \(m*_n\), \(\;m*_p\) | - | effective mass | - | - | - |
| \(E\), \(\;\xi\) | xi | effectiveness | - | - | - |
| \(\eta \) | eta | efficiency | % | % | - |
| \(\Theta_e\) | Theta | Einstein temperature | - | - | - |
| \(Ek\) | - | Ekman number | dimensionless | dimensionless | - |
| \(E\) | - | elastic | - | - | - |
| \(\lambda\) | lambda | elastic modulus | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(\lambda_c\), \(\;E_c\) | lambda | elastic modulus of concrete | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(PE\), \(\;E_p\) | - | elastic potential energy | \(ft-lbf\) | \(J\) | - |
| \(S\) | - | elastic section modulus | \(in^2\) | \(mm^2\) | - |
| \(E\) | - | elasticity | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(El\) | - | elasticity number | dimensionless | dimensionless | - |
| \(q\) | - | electric charge | \(Ah\) | \(C\) | - |
| \(F\) | - | electric capacitance | \(C \;/\; V\) | \(C \;/\; V\) | - |
| \(S\) | - | electric conductance | \(A \;/\; V\) | \(A \;/\; V\) | - |
| \(\rho_{ik}\) | rho | electric conductivity tensor | - | - | - |
| \(\varepsilon_0\) | varepsilon | electric constant | constant | constant | \(8.8542\;x\;10^{-12}\;s^2\;/\;kg\;m\) |
| \(I\) | - | electric current | - | - | - |
| \(J\), \(\;j\) | - | electric current density | - | - | - |
| \(p\) | - | electric dipole moment | - | - | - |
| \(D\) | - | electric displacement | - | - | - |
| \(E\) | - | electric field | - | - | - |
| \(\psi\) | psi | electric flux | - | - | - |
| \(V\), \(\;\phi\) | phi | electric potential | \(W \;/\; A\) | \(W \;/\; A\) | - |
| \(U_e\) | - | electric potential energy | \(ft-lbf\) | \(J\) | - |
| \(\Omega\) | Omega | electric resistance | \(V \;/\; A\) | \(V \;/\; A\) | - |
| \(X_c\) | - | electric susceptibility | - | - | - |
| \(\sigma\) | sigma | electrical conductivity | - | - | - |
| \(R_e\) | - | electrical resistance | \(\Omega\) | \(\Omega\) | - |
| \(\rho \) | rho | electrical resistivity | \(\Omega^{-in}\) | \(\Omega^{-cm}\) | - |
| \(e\) | - | electron | - | - | - |
| \(E_{ea}\) | - | electron affinity | - | - | - |
| \(\frac {m_c}{m_{\alpha}}\) | electron-\(\alpha\) particle mass ratio | - | - | - | |
| electron change / mas ratio | constant | constant | \(-1.758\;820\;088\;x\;10^{11}\;kg^{-1}\;s\;A\) | ||
| \(w_{ce}\) | - | electron cyclotron circular frequency | - | - | - |
| \(\frac {m_e}{m_d}\) | - | electron-deuteron mass ratio | - | - | - |
| \(D_e\) | - | electron diffusion coefficient | - | - | - |
| \(a_{ge}\) | - | electron gravitational coupling constant | dimensionless constant | dimensionless constant | \(2.40\;x\;10^{-43}\) |
| \(E_e\) | - | electron rest energy | constant | constant | \(8.1871\;x\;10^{-14}\;kg\;m^2\;/\;s^2\) |
| \(g_e\) | - | electron g-factor | dimensionless constant | dimensionless constant | \(-2.002\;319\;304\;362\;56\) |
| \(m_e\) | - | electron rest mass | constant | constant | \(9.109\;383\;701\;x\;10^{-31}\;kg\) |
| \(M \left( e \right)\), \(\;M_e\) | - | electron molar mass | - | - | - |
| \(\frac {m_c}{m_{\mu}}\) | mu | electron-muon mass ratio | - | - | - |
| \(n_c\) | - | electron number density | - | - | - |
| \(g_\lambda\) | lambda | electron orbital g-factor | dimensionless constant | dimensionless constant | \(0.993643364\) |
| \(O_e\) | - | electron outer shell multiplier | dimensionless constant | dimensionless constant | \(2.138743820\) |
| \(K_e\) | - | electron partical wave center point | dimensionless constant | dimensionless constant | \(10\) |
| \(w_{pe}\) | - | electron plasma circular frequency | - | - | - |
| \(\frac {m_c}{m_p}\) | - | electron-proton mass ratio | dimensionless constant | dimensionless constant | \(5.446\;170\;2178\;x\;10^{-4}\) |
| \(r_e\) | - | electron radius | constant | constant | \(2.8179\;x\;10^{-15}\;m\) |
| \(\frac {-e}{m_e}\) | - | electron specific charge | - | - | - |
| \(g_a\) | - | electron spin g-factor | dimensionless constant | dimensionless constant | \(0.976448541\) |
| \(T_e\) | - | electron temperature | - | - | - |
| \(e\) | - | electronic charge | - | - | - |
| \(u \;or\; w\) | - | electromagnetic energy density | - | - | - |
| \(E\), \(\;\varepsilon\) | varepsilon | electromotive force (EMF) | - | - | - |
| \(F_e \) | - | electrostatic force | - | - | - |
| \(dl\), \(\;ds\) | - | element of path | - | - | - |
| \(e\), \(\;e_e\) | - | elementary change | constant | constant | \(1.602\;176\;634\;x\;10^{-19}\;C\) |
| \(y\) | - | elevation | \(ft\) | \(m\) | - |
| \(y_i\) | - | elevation at inlet | \(ft\) | \(m\) | - |
| \(y_o\) | - | elevation at outlet | \(ft\) | \(m\) | - |
| \(\Delta y\) | Delta | elevation differential | \(ft\) | \(m\) | - |
| \(E\) | - | emission rate | \(lb \;/\; hr\) | \(kg \;/\; hr\) | - |
| \(\epsilon\) | epsilon | emissivity | - | - | - |
| \(E\) | - | emissive power | \(Btu \;/\; hr-ft^2\) | \(W \;/\; m^2\) | - |
| \(\gamma\) | gamma | empirical constant | \(1\;/\; F\) | \(1\;/\;C\) | - |
| \(\epsilon\) | epsilon | empirical loss coefficient | dimensionless | dimensionless | - |
| \(r\) | - | empirical rate | - | - | - |
| \(E\), \(\;W\) | - | energy | \(ft-lbf\) | \(J\) | - |
| \(E\), \(\;W\) | - | energy | \(Btu\) | \(kJ\) | - |
| \(E\), \(\;W\) | - | energy | \(HP-hr\) | \(MJ\) | - |
| \(\Delta E\) | - | energy differential | \(ft-lbf\) | \(J\) | - |
| \(EER\) | - | energy efficiency ratio or rating | \(Btu \;/\; W-hr\) | - | - |
| \(\epsilon\) | epsilon | energy of particle | - | - | - |
| \(E_g\) | - | energy gap | - | - | - |
| \(EHP\), \(\;HP_e\) | - | engine horsepower | \(hp\) | \(hp\) | - |
| \(RPM\) | - | engine speed | rpm | \(rad \;/\; s\) | - |
| \(H\) | - | enthalpy | \(ft-lbf\) | \(J\) | - |
| \(\large{ \partial H }\) | partial | enthalpy rate of change | - | - | - |
| \(S\) | - | entropy | \(ft-lbf \;/\; ^\circ F\) | \(J\;/\;K\) | - |
| \(\Delta S\) | Delta | entropy differential | \(ft-lbf \;/\; ^\circ F\) | \(J\;/\;K\) | - |
| \(\phi\) | phi | entropy function | \(ft-lbf \;/\; ^\circ F\) | \(J\;/\;K\) | - |
| \(Eo\) | - | Eotvos number | dimensionless | dimensionless | - |
| \(K\) | - | equilibrium constant | - | - | - |
| \(EW\) | - | equivalent weight | \(lbm\;/\;lbmol\) | \(kg\;/\;kmol\) | - |
| \(n\), \(\;n_n\), \(\;n^{12}\) | - | electron number density | - | - | - |
| \(\gamma\) | gamma | empirical constant | \(1 \;/\; F\) | \(1 \;/\; C\) |
- |
| \(r\) | - | empirical rate constant | \(1 \;/\; hr\) | \(1 \;/\; s\) | - |
| \(Er\) | - | Ericksen number | dimensionless | dimensionless | - |
| \(v_e\) | - | escape velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(A\) | - | estimated annual soil loss | \(ft^3\) | \(m^3\) | - |
| \(A_e\), \(\;P_e\) | - | Ettinghausen coefficient | - | - | - |
| \(Eu\) | - | Euler number | dimensionless constant | dimensionless constant | \(2.718\;281\;828\;459...\) |
| \(\Delta h_f\) | Delta | evaporation enthalpy change | - | - | - |
| \(\Theta_r\) | Theta | Excess temperature coefficient | dimensionless | dimensionless | - |
| \(J\) | - | exchange integral | - | - | - |
| \(Y\) | - | expansion coefficient | - | - | - |
| \(Y\) | - | expansion factor | dimensionless | dimensionless | - |
| \(e\) | - | exponential constant | - | - | - |
| \(p_e\) | - | external pressure | \(psi\) | \(MPa\) | - |
| \(r_e\) | - | external radius | \(in\) | \(mm\) | - |
| Symbol | Greek Symbol | Definition | US | Metric | Value |
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