A vacuum pressure gauge in which a relatively large volume of a low-pressure gas is compressed to a small volume in a glass apparatus (see illustration). The volume is reduced to an extent that causes the pressure to rise sufficiently to support a column of fluid high enough to read. This simple device, which relies on Boyle's law, is suitable for measuring pressures in the range 103 to 10-3 pascal. It is named after H. McLeod (1841–1923).
McLeod gauge
- lambert
- Lambert's laws
- laminar flow
- laminated core
- Landau damping
- Landau ghost
- Landé interval rule
- Langevin equation
- Langmuir frequency
- Laplace equation
- Larmor precession
- laser
- laser printer
- latent heat
- lateral inversion
- lateral velocity
- latitude and longitude
- lattice
- lattice energy
- lattice gauge theory
- lattice vibrations
- latus rectum
- Laue, Max Theodor Felix von
- launch vehicle
- Lavoisier, Antoine Laurent