He beat only against the impalpable air.

Above float clouds-white ,gray ,andinken, while the clear, impalpable air springs and sparkles like new wine.

To the far-off sea and the unseen winds, and the sane impalpable air;

Priestley, Cavendish and Lavoisier were dissecting the impalpable air and making the gaseous form of substances as familiar and manageable as the solid.