Helium has a density of 0.1786 kg/m3, and air has a density of 1.275 kg/m3. If a balloon is filled with 0.1 m3 of helium

Question

Helium has a density of 0.1786 kg/m³, and air has a density of 1.275 kg/m³. If a balloon is filled with 0.1 m³ of helium, how heavy can the balloon itself be before it will no longer float?

1. What is the mass of helium in the balloon?
2. What is the maximum mass of the balloon?

Answer 1

1. Mass is Density times Volume, just plug in the values
2. What makes the balloon float is the difference in the Densities. So now take that difference and multiply with the Volume. Note that the question is about Mass, not Weight (mass times acceleration of gravity)!