Posted by Kay on Wednesday, February 13, 2008 at 6:40pm.
Taking a helium filled balloon from a warm house to a cold temperature outside will decrease the pressure inside the balloon and it will appear to be losing its gas. This will not be a phase change for it was a gas inside the house and it still is a gas outside on a snowy day. It must get REALLY REALLY cold for helium to change from a gas phase to a liquid phase.
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