Formula Symbols - I
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I
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
|---|---|---|---|---|---|---|
| \(R\) | - | ideal gas constant | \(\large{ \frac{lbf-ft}{lbmol-R} }\) | \(\large{ \frac{J}{kmol-K} }\) | \(J-kmol^{-1} - K^{-1}\) | \(8.31446261815324\) \(\large{ \frac{J}{kmol-K} }\) |
| - | - | ideal gas law | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| - | - | ideal gas law with compressibility factor | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| \(lx\) | - | illuminance | - | - | - | - |
| \(b\) | - | impact parameter | - | - | - | - |
| \(Z_o\) | - | impedance of vacuum | \(\Omega\) | \(\Omega\) | \(kg-m^2-s^{-3}-A^{-2}\) | \(376.730\;313\;461...\) \(\Omega\) |
| \(d\), \(\;d_i\) | - | impeller diameter | \(in\) | \(mm\) | \(mm\) | - |
| \(I\) | - | impulse | \(lbf-sec\) | \(N-s\) | \(kg-m-s^{-1}\) | - |
| \(I\) | - | impulse velocity | \(lbf-sec\) | \(N-s\) | \(kg-m-s^{-1}\) | - |
| \(I\) | - | impulse with time | \(lbf-sec\) | \(N-s\) | \(kg-m-s^{-1}\) | - |
| \(H\), \(\;L\) | - | inductance | \(H\) | \(H\) | \(kg-m^2-s^{-2}-A^{-2}\) | - |
| \(X_L\) | - | inductive reactance | \(H\) | \(H\) | \(kg-m^2-s^{-2}-A^{-2}\) | - |
| \(a_i\) | - | initial acceleration | \(\large{\frac{ft}{sec^2}}\) | \(\large{\frac{m}{s^2}}\) | \(m- s^{-2}\) | - |
| \(I_a\) | - | initial abstraction | \(in\) | \(mm\) | \(mm\) | - |
| \(\omega_i\) | omega | initial angular velocity | \(\large{\frac{rad}{sec}}\) | \(\large{\frac{rad}{s}}\) | \(rad - s^{-1}\) | - |
| \(l_i\) | - | initial length | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(d_1\) | - | initial maneuver distance | \(ft\) | \(m\) | \(m\) | - |
| \(x_i\) | - | initial position | - | - | - | - |
| \(T_i\) | - | initial temperature | \(F\) | \(C\) | \(x+273.15\;K\) | - |
| \(t_i\) | - | initial time | \(sec\) | \(s\) | \(s\) | - |
| \(v_i\) | - | initial velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m- s^{-1}\) | - |
| \(V_i\) | - | initial volume | \(ft^3\) or \(in^3\) | \(m^3\) or \(mm^3\) | \(m^3\) or \(mm^3\) | - |
| \(p_i\) | - | inlet pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| \(E_i\) | - | input energy | \(lbf-ft\) | \(J\) | \(kg - m^2 - s^{-2}\) | - |
| \(W_i\) | - | input work | \(lbf-ft\) | \(J\) | \(kg - m^2 - s^{-2}\) | - |
| \(ID\) | - | inside diameter | \(in\) | \(mm\) | \(mm\) | - |
| \(ID\) | - | inside diameter of pipe | \(in\) | \(mm\) | \(mm\) | - |
| \(D_b\) | - | inside diameter of valve body outlet | \(in\) | \(mm\) | \(mm\) | - |
| \(D_p\) | - | inside diameter of outlet pipe | \(in\) | \(mm\) | \(mm\) | - |
| \(a_i\) | - | instantaneous acceleration | \(\large{\frac{ft}{sec^2}}\) | \(\large{\frac{m}{s^2}}\) | \(m- s^{-2}\) | - |
| \(\alpha_i\) | alpha | instantaneous angular acceleration | \(\large{\frac{rad}{sec^2}}\) | \(\large{\frac{rad}{s^2}}\) | \(rad- s^{-2}\) | - |
| \(v_i\) | - | instantaneous velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m- s^{-1}\) | - |
| \(P\) | - | internal design pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| \(U\) | - | internal energy | \(Btu\) | \(J\) | \(kg - m^2 - s^{-2}\) | - |
| \(p_i\) | - | internal pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| \(r_i\) | - | internal radius | \(in\) | \(mm\) | \(mm\) | - |
| \(e\) | - | internal roughness | \(in\) | \(mm\) | \(mm\) | - |
| \(d\) | - | internal pipe diameter | \(in\) | \(mm\) | \(mm\) | - |
| \(ISD\) | - | intersection sight distance | \(ft\) | \(m\) | \(m\) | - |
| \(G_0^{-1}\) | - | inverse conductance quantum | \(\Omega\) | \(\Omega\) | \(kg-m^2-s^{-3}-A^{-2}\) | \(12\;906.403\;72\) \(\Omega\) |
| \(\alpha^{-1}\) | alpha | inverse fine structure constant | dimensionless | \(137.035\;999\;084\;(21)\) | ||
| \(Ir\), \(\;\xi\) | xi | Iribarren number | dimensionless | - | ||
| \(\alpha\) | alpha | isentropic compressibility | - | - | - | - |
| \(k\) | - | isentropic exponent | - | - | - | - |
| \(\beta\) | beta | isobaric compressibility | - | - | - | - |
| \(H\) | - | isobaric process - enthalpy | \(\large{\frac{Btu}{lbm}}\) | \(\large{\frac{kJ}{kg}}\) | \(kJ- kg^{-1}\) | - |
| \(S\) | - | isobaric process - entropy | \(\large{\frac{lbf-ft}{F}}\) | \(\large{\frac{J}{K}}\) | \(J- K^{-1}\) | - |
| \(\kappa\) | kappa | isothermal compressibility | - | - | - | - |
| Symbol | Greek Symbol | Definition | English | Metric | Value | |
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