# Formula Symbols - I

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

SymbolGreek SymbolDefinitionUSMetric
$$R$$ - ideal gas constant $$ft-lbf/lbmol-^\circ R$$ $$J/kmol\cdot K$$
$$I$$ - impulse $$lbf-sec$$ $$N\cdot s$$
$$L$$ - inductance - $$H$$
$$X_L$$ - inductive reactance - -
$$l_i$$ - initial length - -
$$x_i$$ - initial position - -
$$T_i$$ - initial temperature - -
$$t_i$$ - initial time - -
$$v_i$$ - initial velocity - $$m/s$$
$$V_i$$ - initial volume - -
$$p_i$$ - inlet pressure - -
$$a_i$$ - instantaneous acceleration - -
$$v_i$$ - instantaneous velocity - -
$$I$$ - interference - -
$$U$$ - internal energy $$Btu/lbm$$ $$kJ/kg$$
$$\alpha$$ alpha isentropic compressibility $$1/ ^\circ R$$ $$1/K$$
$$\beta$$ beta isobaric compressibility $$1/ ^\circ R$$ $$1/K$$
$$\kappa$$ kappa isothermal compressibility $$1/ ^\circ R$$ $$1/K$$