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.
Are celebrities more likely to divorce or break up? Earlier this week news reports surfaced that Meryl Streep, 67, and her partner had split up. Is the actress best known for her roles in The Devil Wears Prada or Kramer vs. Kramer really single again? UPDATE 16/04/2017 : This story seems to be false. (read more)