Hey guys, last week I was traveling and grabbed a bag of coffee beans from a cafe. The bag was closed and it did not appear to be “tight” or vacuum sealed to the beans. After the flight home, the bag appeared to have shrunk or “tighten” to the beans inside. Why did this happen?
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Air pressure is lower in a plane than at sea level, there’s less air. The bag of coffee beans lost air whilst on the flight until it had the same air pressure as its surroundings.
If you left it long enough at sea level the reverse would happen and it’d go back to normal.
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