On a cloudy day, a sealed packet of potato chips is taken to the top of a mountain. The packet is found to be blown up like a balloon. This could be because

The ultraviolet radiation has increased.
The packet has a small hole that allowed air to leak in
The air outside is now at a lower pressure than the air inside the packet.
The air outside the packet is hotter than the air inside the packet.

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Mechanical Properties of Matter