Formula Symbols - I
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Formula Symbols
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I
| Symbol | Greek Symbol | Definition | US | Metric | Value |
|---|---|---|---|---|---|
| \(R\) | - | 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 | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(d_1\) | - | initial maneuver distance | \(ft\) | \(m\) | - |
| \(x_i\) | - | 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 | - | - | - |
| \(P\) | - | internal design pressure | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(U\) | - | internal energy | \(ft-lbf\) | \(J\) | - |
| \(e\) | - | internal roughness | - | - | - |
| \(d\) | - | internal pipe diameter | \(in\) | \(mm\) | - |
| \(ISD\) | - | intersection sight distance | \(ft\) | \(m\) | - |
| \(G_0^{-1}\) | - | 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 |
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