(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] mass of gas required to lift another mass

1. The problem statement, all variables and given/known data

A balloon contains gas of density G and is to lift a mass M, including the balloon but not the gas. Show that the minimum mass of gas required is m=(MG)/(A-G) where A is the atmospheric density.

2. Relevant equations

Basic density mass relationships?

3. The attempt at a solution

Obviously the density of the gas is less than the density of the atmosphere, thus the lifting force is possible. I'm just having a hard time seeing the relationships without actual numbers. I tried applying numbers to the situation but that hasn't seemed to help, like making G=.5 and A=1. I need a witty suggestion to jump start me. Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Mass of gas required to lift another mass

**Physics Forums | Science Articles, Homework Help, Discussion**