XEE4139838 Gas pressure: gases are expandable and compressible. On the left, Claude Louis Berthollet\'s experience (1748-1822) with chlorine and air. On the right, a man inflates a bike tire. Anonymous illustration from 1925. Private collection. by Anonymous; Private Collection; (add.info.: Gas pressure: gases are expandable and compressible. On the left, Claude Louis Berthollet\'s experience (1748-1822) with chlorine and air. On the right, a man inflates a bike tire. Anonymous illustration from 1925. Private collection.); Stefano Bianchetti; out of copyright.