Cavendish had already discovered what he designated "inflammable air," though no one had as yet given it its later title of hydrogen gas.

To remedy this defect, Mr. Tytler has got it covered with a varnish to retain the inflammable air after the balloon is filled.

The different sorts of airs, such as putrid airs or inflammable air, were looked upon as atmospheric air with some impurities, much like muddied water.

This is generally credited as showing the discovery of hydrogen, since it describes the density of 'inflammable air', which forms water on combustion.

Cavendish is noted for his discovery of hydrogen or what he called "inflammable air".

He described the density of inflammable air, which formed water on combustion, in a 1766 paper "On Factitious Airs".

By combining metals with strong acids, Cavendish made hydrogen (H) - which he called "inflammable air" - by dissolving metals in acids.

This is generally credited to show the discovery of hydrogen, since it describes the density of 'inflammable air', which formed water on combustion.

Yet, if water could be made by burning inflammable air, then water is not an element, but a compound.

Joseph continued his scientific and scholarly work in his new laboratory, identifying carbon monoxide (which he called "heavy inflammable air").