Why do cellphone waterproof ratings have a time limit? Example 6 meters for 30 minutes.

Question

Why do cellphone waterproof ratings have a time limit? Example 6 meters for 30 minutes.

In: 54

Answer 1

It’s a procedure called osmosis.
The lower in the water you go, the higher the pressure.
Phones can’t be completely waterproof because they are still made of different components which have very small “cracks” or “fissures” between them.

Since those cracks are so small, it takes water a longer time to enter but the higher the pressure, the easier it will be for the water to enter the nearest low pressure object, that being the phone.

Edit: Osmosis was the wrong term, my bad.