【化】 闪点

Flashing \Flash"ing\, n.
1. (Engineering) The creation of an artifical flood by the
sudden letting in of a body of water; -- called also
{flushing}.

2. (Arch.) Pieces of metal, built into the joints of a wall,
so as to lap over the edge of the gutters or to cover the
edge of the roofing; also, similar pieces used to cover
the valleys of roofs of slate, shingles, or the like. By
extension, the metal covering of ridges and hips of roofs;
also, in the United States, the protecting of angles and
breaks in walls of frame houses with waterproof material,
tarred paper, or the like. Cf. {Filleting}.

3. (Glass Making)
(a) The reheating of an article at the furnace aperture
during manufacture to restore its plastic condition;
esp., the reheating of a globe of crown glass to allow
it to assume a flat shape as it is rotated.
(b) A mode of covering transparent white glass with a film
of colored glass. --Knight.

{Flashing point} (Chem.), that degree of temperature at which
a volatile oil gives off vapor in sufficient quantity to
burn, or flash, on the approach of a flame, used as a test
of the comparative safety of oils, esp. kerosene; a
flashing point of 100[deg] F. is regarded as a fairly safe
standard. The burning point of the oil is usually from ten
to thirty degree above the flashing point of its vapor.
Usually called {flash point}.

Flash point \Flash" point`\, n.
1. the lowest temperature at which the vapors given off by a
volatile liquid exposed to air will burst into flame when
approached by a flame. Also called {flashing point}.
[PJC]

2. That point in time or that degree of provocation at which
someone will suddenly begin to act vigorously; -- often
used in reference to angry reactions.
[PJC]