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.
In Ricki, Streep plays the title character, a rhythm guitarist and lead singer for a small-time band who years ago made the choice to sacrifice family responsibilities for a shot at fame. Streep, 65, finally learned to play guitar for the film written by Diablo Cody (Juno). As you can see in the clip above, Streep took to the instrument as well as sheâs handled every other challenge in her career.