Answer: inkaku (陰核)
the flash(ing) point
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° 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.
This is the first and principal point at which we can stanch the wastage of teaching energy that now goes on. The Salvaging Of Civilisation | H. G. (Herbert George) Wells His also was the intellectual point of view and the intellectual interest in knowledge and its deductions.
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Definition of flash point. 1 : the lowest temperature at which vapors above a volatile combustible substance ignite in air when exposed to flame. 2 : a point at which someone or something bursts suddenly into action or being. 3 : tinderbox sense 2.
In chemistry the flash point of a volatile material is the lowest temperature at which its vapors ignite if given an ignition source. The flash point is sometimes confused with the autoignition temperature the temperature that causes spontaneous ignition. The fire point is the lowest temperature at which the vapors keep burning after the...