Chapter 17, Problem 19STP

To determine

The reasons for using the helium instead of hydrogen in blimps.

Explanation of Solution

Introduction:

In past, hydrogen and helium were used in blimps as a lifting gas. Hydrogen and helium both are lighter than air.

Helium is preferred over the hydrogen in blimps. Helium is more stable than hydrogen because it is a noble gas. The reactivity of helium is less compared to hydrogen. Hydrogen is flammable in nature and helium is not flammable. Hydrogen is more reactive as compares to helium.

Conclusion:

Thus, due to the less reactivity and more stability in nature, helium is preferred over hydrogen in blimps.