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Sally has an inflatable doll filled with he- lium at the circus. Jane has an identical doll filled with argon at the circus. They sit next to each...

Sally has an inflatable doll filled with he-
lium at the circus. Jane has an identical doll
filled with argon at the circus. They sit next
to each other and discuss chemistry. They
argue over whose balloon has gas molecules
zipping around at greater average velocities.
Resolve the argument.

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