Formula Symbols - I

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

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I

SymbolGreek SymbolDefinitionUSMetricValue
\(R\) - ideal gas constant constant constant \(0.082\;06\;L\;atm\;mol^{-1}\;K^{-1}\)
\(lx\) - illuminance - \(lm\;/\;m^2\)  -
\(b\) - impact parameter - -  -
\(Z\) - impedance - -  -
\(Z_o\) - impedance of vacuum constant constant \(376.730\;313\;461...\;kg\;m^2\;s^{-3}\;A^{-2}\)
\(d\), \(\;d_i\) - impeller diameter \(in\) \(mm\)  -
\(I\) - impulse \(lbf-sec\) \(N-s\)  -
\(I\) - incident energy \(Btu \;/\; ft^2-hr\) \(W \;/\; m^2\)  -
\(H\), \(\;L\) - inductance - \(Wb\;/\;A\)  -
\(n\) - index of refraction - -  -
\(X_L\) - inductive reactance - -  -
\(a_i\) - initial acceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\)  -
\(I_a\) - initial abstraction \(in\) \(mm\) -
\(\omega_i\) omega initial angular velocity \(ft\;/\;sec\) \(m\;/\;s\)  -
\(l_i\) - initial length \(in \;or\; ft\) \(mm \;or\; m\)  -
\(x_i\) - initial position - -  -
\(T_i\) - initial temperature \(^\circ F\) \(C\)  -
\(t_i\) - initial time \(sec\) \(s\)  -
\(v_i\) - initial velocity \(ft\;/\;sec\) \(m\;/\;s\)  -
\(V_i\) - initial volume \(in^3 \;or\; ft^3\) \(mm^3 \;or\; m^3\)  -
\(p_i\) - inlet pressure \(lb\;/\;ft^2 \;or\; psi\) \(Pa\)  -
\(E_i\) - input energy \(ft\;-\;lbf\) \(J\)  -
\(W_i\) - input work \(ft\;-\;lbf\) \(J\)  -
\(ID\) - inside diameter \(in\) \(mm\)  -
\(ID\) - inside diameter of pipe \(in\) \(mm\) -
\(D_b\) - inside diameter of valve body outlet \(in\) \(mm\)  -
\(D_p\) - inside diameter of outlet pipe \(in\) \(mm\)  -
\(a_i\) - instantaneous acceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\)  -
\(\alpha_i\) alpha instantaneous angular acceleration \(lbf\;/\;ft^2-sec\) \(Pa-s\)  -
\(v_i\) - instantaneous velocity - -  -
\(n_i\) - instrinsic number density - -  -
\(I\) - interference - -  -
\(a\) - interference factor - -  -
\(alpha\) alpha internal conversion coefficient - -  -
\(U\) - internal energy \(ft-lbf\) \(J\)  -
\(e\) - internal roughness - -  -
\(d\) - internal pipe diameter \(in\) \(mm\)  -
\(G_0^{-1}\) - inverse conductance quantum constant constant \(1.290\;640\;372\;17\;x\;10^4\;kg\;m^2\;s^{-3}\;A^{-2}\)
\(\alpha^{-1}\) alpha inverse fine structure constant dimensionless constant dimensionless constant \(137.035\;999\;084\)
\(w_{ci}\) - ion cyclotron circular frequency - -  -
\(T_i\) - ion temperature - -  -
\(Ir\), \(\;\xi\) xi Iribarren number dimensionless dimensionless  -
\(\alpha\) alpha isentropic compressibility \(1\;/\; R\) \(1\;/\;K\)  -
\(k\) - isentropic exponent - -  -
\(\beta\) beta isobaric compressibility \(1\;/\; R\) \(1\;/\;K\)  -
\(\kappa\) kappa isothermal compressibility \(1\;/\; R\) \(1\;/\;K\)  -
Symbol Greek Symbol Definition US Metric Value