# Formula Symbols - L

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

## Formula Symbols - L

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 SymbolDefinitionUSMetricValue
$$L$$ - Lagrangian function - - -
$$La$$ - Laplace number dimensionless dimensionless  -
$$L$$ - latent heat $$Btu \;/\; lbm$$ $$J \;/\; kg$$  -
$$L$$, $$\;L_s$$   latent heat of steam $$Btu \;/\; lbm$$ $$J \;/\; kg$$  -
$$h_{fg}$$ - latent heat of vaporization $$Btu \;/\; lbm$$ $$J \;/\; kg$$  -
$$\delta '$$ delta lateral deflection $$deg$$ $$rad$$  -
$$\epsilon '$$, $$\;\epsilon_t$$ epsilon lateral strain (transversal strain) $$ft$$ $$m$$  -
$$a$$, $$\;L$$, $$\;l$$ - length $$in \;or\; ft$$ $$mm \;or\; m$$  -
$$l_d$$, $$\;\Delta l$$ delta length differential - -  -
$$\Gamma$$ Gamma level width - -  -
$$Le$$ - Lewis number dimensionless dimensionless  -
$$C_l$$ - lift coefficient dimensionless dimensionless  -
$$L$$ - lift force $$lb$$ $$N$$  -
$$C_L$$ - lift number dimensionless dimensionless  -
$$c$$ - light (vacuum) $$ft\;/\;sec$$ $$m\;/\;s$$  -
$$\lambda_c$$ lambda linear attenuation coefficient - -  -
$$\lambda$$ lambda linear concentration dimensionless dimensionless  -
$$s$$ - 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 $$lb-ft\;/\;sec$$ $$kg-m\;/\;s$$  -
$$R$$, $$\;R_l$$ - linear range - -  -
$$S$$, $$\;S_l$$ - linear stopping power - -  -
$$e$$, $$\;\epsilon$$ 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 dimensionless  -
$$T_i$$ - liquid inlet temperature $$^\circ F$$ $$C$$  -
$$F_l$$ - liquid pressure recovery factor dimensionless dimensionless  -
$$T_o$$ - liquid outlet temperature $$^\circ F$$ $$C$$  -
$$SG_l$$, $$\;G_f$$ - liquid specific gravity dimensionless dimensionless  -
$$c_l$$ - liquid specific heat $$Btu\;/\;lb- ^\circ F$$ $$kJ\;/\;kg-K$$  -
$$LL$$ - 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 dimensionless  -
$$x$$, $$\;y$$ - location $$in$$ $$m$$  -
$$\Lambda$$ Lambda logarithmic decrement - -  -
$$LMTD$$ - logarithmic mean temperature differential - -  -
$$s$$ - long range order parameter - -  -
$$\delta$$ delta longitudinal deflection - -  -
$$\epsilon$$, $$\;\epsilon_a$$ epsilon longitudinal strain (axial strain) $$ft$$ $$m$$  -
$$\sigma_l$$ sigma longitudinal stress $$ft$$ $$m$$ -
$$L$$ - Lorenz coefficient - -  -
$$n_o$$ - Loschmidt constant constant constant $$2.686\;7805\;x\;10^{25}\;m^{-3}$$
$$K$$ - loss coefficient dimensionless dimensionless  -
$$F_l$$ - loss factor - -  -
$$L_n$$ - loudness level - -  -
$$h$$, $$\;k$$, $$\;l$$ - Love numbers dimensionless dimensionless  -
$$LHV$$ - lower heating value $$Btu \;/\; lbm$$ $$kJ \;/\; kg$$  -
$$LRFD$$ - load and resistance factor design - -  -
$$L$$ - luminosity - $$W$$  -
$$K_{cd}$$ - luminous efficacy constant constant  -
$$S$$ - Lundquist number dimensionless dimensionless  -