Formula Symbols - I
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
| Symbol | Greek Symbol | Definition | US | Metric |
|---|---|---|---|---|
| \( R\) | - | ideal gas constant | - | \(JK^{-1} mol^{-1}\) |
| \(lx\) | - | illuminance | - | \(lm\;/\;m^2\) |
| \(b\) | - | impact parameter | - | - |
| \(Z\) | - | impedance | - | - |
| \(I\) | - | impulse | \(lbf-sec\) | \(N-s\) |
| \(I\) | - | incident energy | \(Btu \;/\; ft^2-hr\) | \(W \;/\; m^2\) |
| \(H \;or\; L\) | - | inductance | - | \(Wb\;/\;A\) |
| \(n\) | - | index of refraction | - | - |
| \(X_L\) | - | inductive reactance | - | - |
| \(a_i\) | - | initial acceleration | \(ft\;/\;sec^2\) | \(m\;/\;s^2\) |
| \(\omega_i\) | omega | initial angular velocity | \(ft\;/\;sec\) | \(m\;/\;s\) |
| \(l_i\) | - | initial length | - | - |
| \(x_i\) | - | initial position | - | - |
| \(T_i\) | - | initial temperature | - | - |
| \(t_i\) | - | initial time | \(sec\) | \(s\) |
| \(v_i\) | - | initial velocity | \(ft\;/\;sec\) | \(m\;/\;s\) |
| \(V_i\) | - | initial volume | - | - |
| \(p_i\) | - | 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 | \(in\) | \(mm\) |
| \(D_b\) | - | 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 | \(in\) | \(mm\) |
| \(w_{ci}\) | - | ion cyclotron circular frequency | - | - |
| \(T_i\) | - | ion temperature | - | - |
| \(\alpha\) | alpha | isentropic compressibility | \(1\;/\; R\) | \(1\;/\;K\) |
| \(k\) | - | isentropic exponent | - | - |
| \(\beta\) | beta | isobaric compressibility | \(1\;/\; R\) | \(1\;/\;K\) |
| \(\kappa\) | kappa | isothermal compressibility | \(1\;/\; R\) | \(1\;/\;K\) |