The Romance of Modern Chemistry
Forfatter: James C. Phillip
År: 1912
Forlag: Seeley, Service & Co. Limited
Sted: London
Sider: 347
UDK: 540 Phi
A Description in non-technical Language of the diverse and wonderful ways in which chemical forces are at work and of their manifold application in modern life.
With 29 illustrations & 15 diagrams.
Søgning i bogen
Den bedste måde at søge i bogen er ved at downloade PDF'en og søge i den.
Derved får du fremhævet ordene visuelt direkte på billedet af siden.
Digitaliseret bog
Bogens tekst er maskinlæst, så der kan være en del fejl og mangler.
FLAME: WHAT IS IT?
the eye. Solids begin to emit light when they are heated
to about 900° Fahrenheit, but vapours must be raised
to a very much higher temperature before they become
visible. When a combustible vapour re-
acts chemically with the oxygen in the
air, which is the supporter of com-
bustion, the heat produced is intense
enough to raise the vapour to the
point of incandescence—a flame is pro-
duced.
We have spoken here of a com-
bustible substance and a supporter of
combustion as being necessary for the
production of flame, but it is well to
remember that these terms are purely
relative. If we could picture this
world and its inhabitants as quite dif-
ferent from what they are, and could
imagine that the atmosphere round the
globe was one of hydrogen instead of
air, then the gas companies would have
to supply us with oxygen for lighting
and heating purposes. In such a world
oxygen would be regarded as the com-
bustible substance, and hydrogen as the
supporter of combustion.
It is, in fact, easy to show that air
burns in coal gas quite as readily as
T
air
Fig. 4.—A sketch of
an experiment show-
ing that air can be
burned in an atmos-
phere of coal gas.
coal gas burns in air. In the accompanying Fig. 4 the
apparatus necessary for this experiment is shown. A
lamp glass is fitted at the bottom with a cork, through
which pass two tubes. The one which ends just above
the cork is connected with the gas supply, the longer
155