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boundary lubrication
A state of partial lubrication in
a plain bearing where there is no oil film, only an
adsorbed monomolecular layer of lubricant in the
surfaces.

Bourdon tube pressure gauge
A gauge in which fluid
pressure tends to straighten a curved, flattened tube
connected to a pointer mechanism; pressure is read
from a circular scale. A differential form is available
having two tubes connected to a single pointer.

Boyle’s law
States that, for a ‘perfect gas’ the volume
of a given mass varies inversely as the pressure at
constant temperature.

brittle fracture
Fracture of a material with little or no
plastic deformation.

bevel gear
A toothed wheel with teeth formed on a
conical surface used for transmitting rotation from a
shaft to one at an angle to it in the same plane, usually
at right angles.

binary numbers
A scale of numbers with ‘radix’ equal
to 2 as opposed to the usual scale radix of 10 (decimal
numbers). Only two symbols are used: 0 and 1.

black body
In the study of radiation of heat, a body
which completely absorbs heat or light falling on it.

blackbody radiation
The quantity or quality of
radiation from a black body, e.g. from the inside of a
cavity.

bmomial distribution
A distribution used in statistics
based on the binomial theorem which gives the
probability of an event taking place.

bending moment
The algebraic sum of the moments
of all the forces to either side of a transverse section of a
beam, etc.


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