"Having collected an elastic fluid, and observing that its elasticity is increased by heat and diminished by cold; when at the same time it retains constantly its elastic fluidity, and has properties and relations quite different of those, which are found in common Air I think myself entitled to conclude that this is a peculiar kind of Air, I assert that such collected Air ought to preserve its elasticity even in the most intense cold; since otherwise innumerable kinds of Air must be allowed; as it is highly probable that all substances may be changed into a vapour similar to Air by an intense heat."
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Chemical Observations and Experiments on Air and Fire
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