Chapter L: La Lux

La

lanthanum (element)

lambert

ILLUMINATION

lambert =

0.31831 cd/cm 2	929 lm/ft 2
295.72 cd/ft 2	1 E + 04 lm/m 2
2.054 cd/in. 2	1 E + 04 lx
3183 cd/m 2	1000 mL
929 ft-cd	1000 mph
929 ft-L	1 ph
1 lm/cm 2

See also ILLUMINATION.

laminar flow

fluid (or gas) flowing in layers, as in nonturbulent flow, where the Reynold's number is less than 2000 by calculation.

latent heat

See also HEAT TRANSFER.

law of cosines

TRIGONOMETRY

See also trigonometry table of function value (angle in degrees).

law of sines

TRIGONOMETRY

See also trigonometry table of function value (angle in degrees).

laws of thermodynamics

THERMODYNAMICS

league (nautical) =

3038 fathoms	1.1508 leagues (stat)
18,228 ft	3 mi (naut)
5.556 km	3.4523 mi (stat)

league (statute) =

2640 fathoms	0.869 league (naut)
15,840 ft	2.6069 mi (naut)
4.83 km	3 mi (stat)

See also THERMODYNAMICS.

LEL

lower explosive limit

Lenz's law

See also ELECTROMAGNETISM.

leverage

the use of a lever arm and applied force for mechanical advantage, where

d	= distance, ft
F	= force, lb
W	= weight, lb

force required,

lever arm

the perpendicular distance from a force to a point of rotation.

LHV

lower heating value

Li

lithium (element)

lighting terms

See also ILLUMINATION.

light speed

VELOCITY OF LIGHT

See also viscosity, absolute; absolute viscosity; coefficient of viscosity; dynamic viscosity.

light-year

the distance that light travels through space in a period of 1 yr.

light-year =