All that water vapor and steam gets into the phone. When you bring it back into a cooler room, it all condenses and causes water damage. It's worse than leaving the charging port cover open on an S5. The vapor gets into every little air space inside the phone, no matter how small, it's just humid air. You really need an airtight phone to bring into a hot humid environment like that.
I don't think it's the heat itself - if the room was hot enough to affect the phone, either you're in a sauna, a steam lodge or you're risking death. It's the fact that the warmer the air, the more moisture it holds. When the phone (and the air inside it) cools off, that moisture condenses, and you have water damage all over the inside of the phone.
Can i ask i took my s6 edge plus into a car which was very humid due to windows being left open and rain getting in.
The temperature is cold here like 10C or less the windscreen is always full of condensation.
I forgot about this when i sat in the car and took my phone out to use it. Prior to that i had the heating on so the air was warmed up so obviously more moisture in the air inside the car. I got out of the car and came back 20 mins later by which time the air had cooled a bit inside but was still a bit damp humid. It was only 7C outside so cold. Inside i would say it was 12C with high relative humidity i could feel my hands and clothes getting wet as the cold outside temp on my clothes met the warmer humid air inside the car.
My question is how much if that humid air would have gotten inside the phone via the headphone jack, speaker and charging port? It was maybe 10 mins i sat inside the humid car before i realised.
Weirdly no condensation was on the screen maybe cos the temperature of the phone was above the dew point temperature but my hands and clothes were below hence the dampness.
Is it possible a lot of that coldish-warm humid air got inside my phone through those small entrances?
I know it's important to keep it above the dew point temperature to avoid condensation forming inside the phone.
I put it in a bag of silica gel but only had a few packets so not enough and ziplocked it overnight the problem is that the temp dropped overnight meaning it must have fell below the due point and whatever moisture was inside would have condensed.
What else could i do? I know steam and moisture humid air can be worse than dropping it in water as the air can get into places which water cant and factor in the varying temp betwedn night n day guarantees condensation forming. Is 8 hours enough time for silica to remove the humid air inside my phone?