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Physics, 14.09.2019 08:30 Kekkdkskdkdk
You have a balloon that contains 1 kg of helium that occupies a volume of 4 m sometime later, the balloon still holds 1 kg of helium, but it now occupies a volume of 2m'. your friend suggests that the helium can be considered an isolated system in this case. can they be correct?
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