Skip to main content
Q
- Quantum - If the magnitude of
a quantity is always an integral multiple of a definite unit, then
that unit is called the quantum of the electromagnetic field and
the meson is considered to be the quantum of the nuclear
field.
- Quantum Mechanics - A
system of mechanics based on quantum theory, which arose out of the
failure of classical mechanics and electromagnetic theory to
provide a consistent explanation of both electromagnetic wave and
atomic structure.
- Quantum Theory - the study of the jumps from
one energy level to another as it relates to the structure and
behavior of atoms.
- Quasi-Cleavage Fracture - A
fracture mode that combines the characteristics of cleavage
fracture and dimpled rupture fracture. An intermediate type of
fracture found in certain high-strength metal.
- Quenching - The rapid
cooling of a metal by immersing it in a bath of liquid in order to
improve its properties.
- Quenching of
Fluorescence - The loss of
fluorescence by causes other than the removal of the exciting
radiation, for example, the action of heat, strong oxidizing
agents, or strong acids or alkalis.
- Quick-Breaking - The sudden
breaking of a direct current to be induced in the part by the rapid
collapse of the magnetic field. In magnetic particle testing, fast
breaking of the magnetizing current in a part which is favorable
for finding transverse defects at the ends of longitudinally
magnetized bars. Such defects are often concealed by the strong
polarity at the bar ends. At such locations the lines of force of
the longitudinal field are leaving the bar in a direction normal to
the surface, which prevents them from intercepting transverse
defects in those areas. The field induced by the transient current
does intercept such discontinuities.