A store receives a shipment of defective balloons. Each has a tiny pinhole of the same size. If one balloon is filled with helium and another is filled with air to the same volume and pressure, which balloon will deflate faster and how much faster? The density of helium at room temperature is 0.00016 g/mL and that of air is 0.0012 g/mL.
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Helium is the lighter gas (density less and atomic mass/molar mass less) so it will pass through the whole faster. You don't need a pinhole, either. Helium is small enough that it will pass through the pores of the balloon over a day or so.
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