Question

What is the buoyancy force upwards due to the air surrounding the balloon?

ii) If we heat the air inside the balloon from 293 K (or 20˚ C) to 393 K (or 120˚ C), how does the mass of the air inside the balloon compare to the mass of an equivalent volume of air outside the balloon?

The mass of the air inside the balloon is larger. The mass of the air inside the balloon is smaller.

The mass of the air inside the balloon is the same as the mass of the air in an equivalent volume outside the balloon.

If we heat the air inside the balloon from 293 K (or 20 C) to 393 K (or 120 C), what is the numerical value for the mass (in kg) of the air inside the balloon for this hotter temperature? (Hint, think about how the number of air molecules inside the balloon has changed. Is it 1/2 (or 1/3 or etc) as many molecules? )

Answer 1

Hope this helps...