Helium is preferred to hydrogen in air balloons because it
(a)	is cheaper	(b)	is less dense
(c)	has greater lifting power	(d)	does not form an explosive mixture with air

Question ID - 51723 | SaraNextGen Top Answer

Helium is preferred to hydrogen in air balloons because it
(a)	is cheaper	(b)	is less dense
(c)	has greater lifting power	(d)	does not form an explosive mixture with air