eli5 How do waterproof phones work? Why are most phones only waterproof for a certain period of time?
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Waterproof is a marketing version of a specific standard, like Intrusion Protection IP67 in the case of the iPhone. This standard requires a specific test, 1m of water for 30 minutes with no failure. That defines the test that the company ran, not how waterproof the phone is. The lawyers make the marketing people mention these parameters (1m for 30 mins) because they want to avoid future lawsuits.
In fact, Apple might know the actual failure point of the average iPhone, as part of some destructive testing program. Maybe it’s 7m of water or 1m for 3 days. That’s not enough for IP68 (which I think requires 10m). So, no reason for Apple to tell anybody that.
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