The balloon will float until the density of its gas equals the density of the surrounding air. The density of the air decreases as altitude increases; because of gravity; gas molecules are more sparse at higher elevations. The air is thinner at high altitudes.
The latest big moment came when he landed the part of Meryl Streepâs bandmate and lover in director Jonathan Demmeâs new film, Ricki and the Flash, which opens Friday (Aug. 7). Meryl Streep Covers Gaga, Springsteen, Petty for New Film, 'Ricki and the Flash'. And it almost didnât happen.
Rick Springfield on What Itâs Like to Jam with Meryl Streep. And get the snot beaten out of you by Colin Farrell. By Andrew Toth/Getty Images. This has been a nice summer for Rick Springfield, the Australian-born actor and rock star whose career took off in the U.S. back in 1981.