I understand if you left something in water for like days it would probably go bad. But why does minutes make a difference? And is depth solely down to water pressure?

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NekuraHitokage t1_j9wpc65 wrote on February 25, 2023 at 2:33 AM

Water is a solvent and a pretty good one at that.

Your phone is mostly held together with adhesives.

The water will soak into and destroy those adhesives after a time, but not so fast that you have to worry about a momentary submersion.

As it soaks, water begins to make the adhesive fail. As more water gets between the glass and adhesive, it fails faster and faster.

Depth inscreases this because some of the waterresistance is also caused by air pressure inside the phone at points that need to be open like speaker grilles. The tiny holes help prevent water from making it in due to the air inside the phone. Past a point, the pressure around you compresses the air in the phone, displacing it and replacing the missing air with water. So yes, it is mostly down to pressure with depth.

Feisty-Location-5708 OP t1_j9wpy8y wrote on February 25, 2023 at 2:38 AM

Thanks. If you know, what things have changed about phones to make them more waterproof, since they didn’t used to be at all?

therealdilbert t1_j9wzp3m wrote on February 25, 2023 at 4:00 AM

all the openings sealed and case glued together. Used to be snapped and screwed together

Way2Foxy t1_j9wrbf6 wrote on February 25, 2023 at 2:49 AM

It's primarily the pressure component. The longer it's in the water, and the higher the pressure of that water, the more the water can seep through tiny crevices.

I've never heard of, and on a search can't find reference to anything about destroying adhesives playing a major role in this.

TerisaKreiger t1_j9xlqlj wrote on February 25, 2023 at 7:57 AM

Yes, depth does make a difference because it affects water pressure, which affects how quickly water can move around and mix with the food you left in it. The shorter the time that food is left in water, the less likely it is to go bad.

PikaTchu47 t1_j9yex2c wrote on February 25, 2023 at 2:03 PM

Are we eating mobile phones now?

nrsys t1_j9xobis wrote on February 25, 2023 at 8:32 AM

Place something underwater, and the pressure of the water all around it will try to push the water in to any small gaps or spaces in the casing.

Depth is important because the deeper underwater you are, the greater the pressure you experience will be - so the deeper you go the harder the water is trying to be pushed into the device.

Time matters because once you reach a pressure where fluid can leak in, this still takes a while to happen. If your gasket is 1mm thick, and the water will be able to push through that seal at a speed of 0.1mm/minute, then your device will stay dry for up to ten minutes, but after that point the water will potentially have compromised it.

So when manufacturers test a device, they choose a pressure and time to test for and to rate the device as.