Question

Though hydrogen is the lightest element it is not used in weather forecasting balloons. Give reason.

Answer 1

• Hydrogen is not used in weather forecasting balloons because it is highly explosive and flammable.
• Helium gas$\left(\mathrm{He}\right)$ is lighter than air and therefore, a helium balloon rises up. it is known as a noble gas.
• Helium is used in balloons in place of hydrogen because it is incombustible. $\mathrm{He}$gas does not catch fire like hydrogen. $\mathrm{He}$ is an inert element