You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>Fluids</strong> <strong>at</strong> RestHOT AIRBALLOONS usehe<strong>at</strong>ed air, which isless dense than thesurrounding air, tocre<strong>at</strong>e an upwardbuoyant force.According to Archi-medes’ Principle,the buoyant force isequal to the weightof the air displacedby the balloon.Paul E. Tippens