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Why Do Crisp Packets Puff Up at High Altitude? The Science Explained

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Have you ever wondered why a bag of crisps ( or potato chips ) expands on an aeroplane? It’s all about air pressure.

The crisp packet was sealed at a lower altitude where atmospheric pressure is higher than at higher altitudes.

As a plane takes off and altitude increases, the atmospheric pressure outside the bag decreases, but the amount of air inside the bag stays the same. This means the air inside the bag now exerts greater pressure on the air outside, making it puff up.

Last Updated on May 13, 2025 by Emma Vanstone

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Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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