# Formula Symbols - L

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

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

SymbolGreek SymbolDefinitionUSMetric
$$L$$ - Lagrangian function - -
$$La$$ - Laplace number dimensionless number dimensionless number
$$L$$ - latent heat $$Btu \;/\; lbm$$ $$J \;/\; kg$$
$$L \;or\;L_s$$   latent heat of steam $$Btu \;/\; lbm$$ $$J \;/\; kg$$
$$h_{fg}$$ - latent heat of vaporization $$Btu \;/\; lbm$$ $$J \;/\; kg$$
$$\delta\;'$$ delta lateral deflection $$deg$$ $$rad$$
$$\epsilon\;'$$ epsilon lateral strain - -
$$a \;or\; L \;or\; l$$ - length $$in \;or\; ft$$ $$mm \;or\; m$$
$$l_d \;or\; \Delta l$$ delta length differential - -
$$\Gamma$$ Gamma level width - -
$$Le$$ - Lewis number dimensionless number dimensionless number
$$C_l$$ - lift coefficient dimensionless number dimensionless number
$$L$$ - lift force $$lb$$ $$N$$
$$C_L$$ - lift number dimensionless number dimensionless number
$$c$$ - light (vacuum) $$ft\;/\;sec$$ $$m\;/\;s$$
$$\lambda_c$$ lambda linear attenuation coefficient - -
$$s$$ - linear displacement $$ft$$ $$m$$
$$\alpha_l$$ alpha linear expansion coefficient $$ft^3$$ $$m^3$$
$$p$$ - linear momentum $$lb-ft\;/\;sec$$ $$kg-m\;/\;s$$
$$p$$ - linear momentum vector $$lb-ft\;/\;sec$$ $$kg-m\;/\;s$$
$$R \;or\; R_l$$ - linear range - -
$$S \;or\; S_l$$ - linear stopping power - -
$$e \;or\; \epsilon$$ epsilon linear strain - -
$$a_t$$ - linear tangential path $$ft$$ $$m$$
$$\alpha$$ alpha linear thermal expansion $$in$$ $$mm$$
$$\alpha_l$$ alpha linear thermal expansion coefficient $$in$$ $$mm$$
$$F_f$$ - liquid critical pressure ratio factor dimensionless number dimensionless number
$$F_l$$ - liquid pressure recovery factor dimensionless number dimensionless number
$$G_f$$ - liquid specific gravity dimensionless number dimensionless number
$$LL$$ - live load - -
$$L$$ - live load for LRFD design - -
$$\gamma_L$$ gamma live load factor in LRFD steel design - -
$$P$$ - load $$lbf$$ $$N$$
$$C_F$$ - load duration factor for wood design - -
$$LRFD$$ - load and resistance factor design - -
$$\omega$$ omega load per unit area $$lbf\;/\;ft^2$$ $$N\;/\;m^2$$
$$\omega$$ omega load per unit length $$lbf\;/\;ft$$ $$N\;/\;m$$
$$w$$ - load per unit length on a beam $$lb\;/\;ft$$ $$N\;/\;m$$
$$K$$ - loading factor - -
$$\chi$$ chi Lockhart-Martinelli parameter dimensionless number dimensionless number
$$x \;or\; y$$ - location $$in$$ $$m$$
$$\Lambda$$ Lambda logarithmic decrement - -
$$LMTD$$ - logarithmic mean temperature differential - -
$$s$$ - long range order parameter - -
$$\delta$$ delta longitudinal deflection - -
$$\epsilon$$ epsilon longitudinal strain - -
$$L$$ - Lorenz coefficient - -
$$K$$ - loss coefficient dimensionless number dimensionless number
$$F_l$$ - loss factor - -
$$L_n$$ - loudness level - -
$$LHV$$ - lower heating value $$Btu \;/\; lbm$$ $$kJ \;/\; kg$$
$$LRFD$$ - load and resistance factor design - -
$$L$$ - luminosity - $$W$$