# Formula Symbols - L

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

## Formula Symbols

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## L

SymbolGreek SymbolDefinitionEnglishMetricSIValue
$$L$$ - Lagrangian function - - - -
$$La$$ - Laplace number dimensionless -
$$Q_l$$ - latent heat $$\large{\frac{Btu}{lbm}}$$ $$\large{\frac{kJ}{kg}}$$ $$kJ - kg^{-1}$$ -
$$L$$, $$\;L_s$$   latent heat of steam - - - -
$$h_{fg}$$ - latent heat of vaporization $$\large{\frac{Btu}{lbm}}$$ $$\large{\frac{kJ}{kg}}$$ $$kJ - kg^{-1}$$ -
$$\delta '$$ delta lateral deflection $$ft$$ $$m$$ $$m$$ -
$$\epsilon '$$, $$\epsilon_t$$ epsilon lateral strain (transversal strain) $$ft$$ $$m$$ $$m$$ -
$$v_0$$ - launch velocity of a projectile $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m - s^{-1}$$ -
- - law of conservation - - - -
$$L$$ - law of conservation of angular momentum $$\large{\frac{lbm-ft^2}{sec}}$$ $$\large{\frac{kg-m^2}{s}}$$ $$kg - m^2 - s^{-1}$$ -
- - law of conservation of energy - - - -
$$\overrightarrow{p}$$   law of conservation of linear momentum $$\large{\frac{lbm-ft}{sec}}$$ $$\large{\frac{kg-m}{s}}$$ $$kg - m - s^{-1}$$ -
- - law of conservation of mass - - - -
- - law of conservation of mechanical energy - - - -
- - law of conservation of momentum - - - -
- - law of thermodynamics - - - -
$$G$$ - leak rate - - - -
$$a$$, $$\;L$$, $$\;l$$ - length $$ft$$ or $$in$$ $$m$$ or $$mm$$ $$m$$ or $$mm$$ -
$$l_d$$, $$\;\Delta l$$ delta length differential $$ft$$ or $$in$$ $$m$$ or $$mm$$ $$m$$ or $$mm$$ -
$$L$$ - length of crest vertical curve for stopping sight distance $$ft$$ $$m$$ $$m$$ -
$$L$$ - length of vertical curve $$ft$$ $$m$$ $$m$$ -
$$\epsilon$$ epsilon Lenz's law - -  - -
$$\Gamma$$ Gamma level width - - - -
$$Le$$ - Lewis number dimensionless -
$$C_l$$ - lift coefficient dimensionless -
$$L$$ - lift force $$lbf$$ $$N$$ $$kg - m - s^{-2}$$  -
$$C_L$$ - lift number dimensionless -
$$c$$ - light (vacuum) - - - -
$$d$$ - lightning strike distance $$mi$$ $$km$$ $$km$$ -
$$\overrightarrow{\lambda_c}$$ lambda linear attenuation coefficient - - - -
$$\overrightarrow{\lambda}$$ lambda linear concentration dimensionless -
$$A,\; B, \;C, \;D, \;E$$ - linear dimension $$ft$$ $$m$$ $$m$$ -
$$\overrightarrow{s}$$ - linear displacement $$ft$$ $$m$$ $$m$$ -
$$\overrightarrow{\alpha_l}$$ alpha linear expansion coefficient $$\large{ \frac{in}{in-F} }$$ $$\large{ \frac{mm}{mm-C} }$$ $$mm - mm^{-1} - C^{-1}$$ -
$$\overrightarrow{f}$$ - linear frequency $$Hz$$ $$Hz$$  $$s^{-1}$$ -
$$\overrightarrow{Imp}$$ - linear impulse $$lbf-sec$$ $$N-s$$ $$kg-m-s^{-1}$$ -
$$\overrightarrow{p}$$ - linear momentum $$\large{\frac{lbm-ft}{sec}}$$ $$\large{\frac{kg-m}{s}}$$ $$kg - m - s^{-1}$$ -
$$\overrightarrow{p}$$ - linear momentum vector - - - -
$$\overrightarrow{s}$$ - linear motion $$ft$$ $$m$$ $$m$$ -
$$\overrightarrow{e}$$, $$\;\overrightarrow{\epsilon}$$ epsilon linear strain - - - -
$$\overrightarrow{a_t}$$ - linear tangential path $$ft$$ $$m$$ $$m$$ -
$$\overrightarrow{\Delta l}$$ - linear thermal expansion $$\large{ \frac{in}{in-F} }$$ $$\large{ \frac{mm}{mm-C} }$$ $$mm - mm^{-1} - C^{-1}$$ -
$$\overrightarrow{\alpha_l}$$ alpha linear thermal expansion coefficient $$\large{ \frac{in}{in-F} }$$ $$\large{ \frac{mm}{mm-C} }$$ $$mm - mm^{-1} - C^{-1}$$ -
- - linear thermal restrained expansion - - - -
$$F_f$$ - liquid critical pressure ratio factor dimensionless -
$$LI$$ - liquid index dimensionless -
$$T_i$$ - liquid inlet temperature $$F$$ $$C$$ $$x+273.15\;K$$ -
$$LL$$ - liquid limit dimensionless -
$$K_la$$ - liquid mass transfer coefficient $$\large{\frac{1}{sec}}$$ $$\large{\frac{1}{s}}$$ $$1-s^{-1}$$ -
$$F_l$$ - liquid pressure recovery factor dimensionless -
$$T_o$$ - liquid outlet temperature $$F$$ $$C$$ $$x+273.15\;K$$ -
$$F_l$$ - liquid pressure recovery factor dimensionless -
$$SG_l$$, $$\;G_f$$ - liquid specific gravity dimensionless -
$$c_l$$ - liquid specific heat $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{J}{kg-K}}$$ $$J - kg - K^{-1}$$  -
$$LL$$ - live load - - - -
$$L$$ - live load for LRFD design - - - -
$$\gamma_L$$ gamma live load factor in LRFD steel design - - - -
$$P$$ - load $$lbf$$ $$N$$ $$kg - m - s^{-2}$$ -
$$C_F$$ - load duration factor for wood design - - - -
$$F$$ - load force $$lbf$$ $$N$$ $$kg - m - s^{-2}$$ -
$$LRFD$$ - load and resistance factor design - - - -
$$\omega$$ omega load per unit area $$\large{\frac{lbf}{ft^2}}$$ $$\large{\frac{N}{m^2}}$$ $$N - m^{-2}$$  -
$$\omega$$ omega load per unit length $$\large{\frac{lbf}{ft}}$$ $$\large{\frac{N}{m}}$$ $$N - m^{-1}$$ -
$$w$$ - load per unit length on a beam $$\large{\frac{lbf}{ft}}$$ $$\large{\frac{N}{m}}$$ $$N - m^{-1}$$ -
$$K$$ - loading factor - - - -
$$\chi$$ chi Lockhart-Martinelli parameter dimensionless -
$$x$$, $$\;y$$ - location $$in$$ $$m$$ $$m$$ -
$$\Lambda$$ Lambda logarithmic decrement - - - -
$$LMTD$$ - logarithmic mean temperature differential $$\large{\frac{Btu}{lbm}}$$ $$\large{\frac{J}{kg}}$$ $$J-kg^{-1}$$ -
$$\delta$$ delta longitudinal deflection - - - -
$$\epsilon$$, $$\;\epsilon_a$$ epsilon longitudinal strain (axial strain) $$\large{\frac{in}{in}}$$ $$\large{\frac{mm}{mm}}$$ $$mm-mm^{-1}$$ -
$$\sigma_l$$ sigma longitudinal stress $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$ -
$$L$$ - Lorentz coefficient - - - -
$$F$$ - Lorentz force $$T$$ $$T$$ $$kg-s^{-2}-A^{-1}$$ -
$$n_o$$ - Loschmidt constant $$ft^3$$ $$m^3$$ $$m^3$$ $$2.686\;7774\;(47)\;x\;10^{25}$$ $$\large{m^3}$$
$$K$$ - loss coefficient dimensionless -
$$L_n$$ - loudness level - - - -
$$h$$, $$\;k$$, $$\;l$$ - Love numbers dimensionless -
$$L$$ - luminosity - - - -
$$K_{cd}$$ - luminous efficacy constant -
$$S$$ - Lundquist number dimensionless -
Symbol Greek Symbol Definition English Metric   Value

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