Question

blimps were once filled with hydrogen, but now helium is used instead. why is helium a better choice than hydrogen? a hydrogen is flammable, while helium is not. b hydrogen is no longer available in pure form. c helium is cheaper than hydrogen. d helium is lighter than hydrogen.

Explanation:

Hydrogen is a highly flammable gas, which poses a significant safety risk for blimps. Helium is an inert gas and is non - flammable, making it a safer choice for filling blimps. Pure hydrogen is still available, helium is generally more expensive than hydrogen, and hydrogen is lighter than helium.

Answer:

A. Hydrogen is flammable, while helium is not.