Helium balloons are pulled by gravity the same as everything else. But because it is pulled less (lighter) than the surrounding air, the air moves downward and the helium takes its place higher up. In a vacuum, helium would fall same as anything else. Once a balloon reaches an altitude where it is the same density as the surrounding air, it will quit rising. Density of gases -> http://chemistry.elmhurst.edu/vchembook/123Adensitygas.html
初めての恋が終わる時 (When the First Love Ends) ♥ English Cover【rachie】 - YouTube
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