Posted by **kelsey** on Sunday, December 7, 2008 at 6:46pm.

The air inside a hot air balloon has an average temperature of 84.3°C. The outside air has a temperature of 15.3°C. What is the ratio of the density of air in the balloon to the density of air in the surrounding atmosphere?

inside / outside = ??

- physics help 2 please! -
**bobpursley**, Sunday, December 7, 2008 at 6:51pm
assuming pressure remained constant, if absolute temp doubled, volume would double, and density would be halved, right?

so that sounds like density is in an inverse relation to abs temp.

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