Use of helium is preferred over use of hydrogen in airships (e.g., blimps ) because

Options

A. helium is chemically less reactive
B. helium has a lower density
C. both of the above
D. none of the above.

Answer

A

Explanation

Helium has a higher density and cost then hydrogen , but it is much safter. Hydrogen readily escapes through tiny holes, and if ignited , it reacts quite readily with oxygen. Helium is essentially inert chemically .