this post was submitted on 20 Jul 2025
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Seriously though.... This will get better gaming performance won't it?
This seems dumb, but I'm struggling to think of why that would be the case.
You need a radiator, otherwise the glass of water will eventually be the same temp as the phone.
phone in toilet. flush when hot.
Largest brain comment of the day
Temps up -> hydrate with lukewarm water -> fill back up -> infinite gaming, infinite hydration
It's rated for about half an hour water resistance, so you'd probably get water ingress before that.
not quite, the glass of water itself acts as a radiator since it has a significantly larger surface area than the phone, and water evaporation cools it down ever so slightly
even at equilibrium it'll probably keep the phone a degree or two colder, i'd wager.
Evaporation will help radiate heat away, but the surface area to volume ratio is much lower than the phone by itself.
The ratio between heat source and surface is much better though.
And that is what matters.
Does it?
I assumed that when the temperature of the glass of water and heat source reach an equilibrium, it will act as one body.
But the water cannit heat itself. It is drawing the heat from the phone. So the heat dissipates and only heats up the entire system for instance by 2°C instead of the phone by itself heating by 20°C until the difference to the environment creates an equilibrium of the energy given to the air around the system.
Water has a high specific heat capacity of about 4.184 joules per gram per degree Celsius (J/g°C) (sic! ddgAI), so getting 200 gramms of tap cold water (12°C) to thermal throttling levels (95°?) needs 4.184x200x83 ≈ 6945 (J).
I got 15 Watts after searching for snapdragon's TDP. If all of that went to heat up the water (I don't think it does), we'd have 463 seconds until the water reaches throttling temps (with even heat discipation in the water).
Let's petition the chip makers to make the throttle temp 105°C, so it will have to boil the water away before it could hit the threshold.
I have a snapdragon 8 gen 3 and I can't really get it to draw more than 6 watts. That would give about 20 minutes without heat dispersal I guess.
This also assumes that heat transfer from the phone is perfect, so it would really throttle a bit earlier as the outside of the phone will always be cooler than the processor.
Could put a few ice cubes in the water I guess.
You forget that the water is in a glass and the glass gives away heat by concection to the surrounding air. For convection and heat transport in a material there is a roughly linear relationship between temperature difference and energy transported. Relative to the 15 watts we can assume the air in the room to be an infinite heat sink with constant temperature.
surface area to volume is only relevant for things that are generating heat throughout
Not for a phone though.
Water can store a shitton of heat. Phones produce comparatively very little heat.
After an hour or two, just replace the now warm water with cold water.
Usually those water resistant seals are just a tiny bit of adhesive gunk like so (looks better before removal obviously). Eventually it may just break down. Also it isn't waterproof, so holes like the charging port, speaker, microphone, stylus, you don't want submerged for long. Might do better flipped upside down, but there is usually a speaker and mic at the top as well.
It is flipped, isn't it? I see a cable coming out and that's usually the bottom.
I'm wondering if the phone in a ziplock bag would work as well. thin plastic but an extra layer of security and a trivial heat insulator. But none of the shock factor lol
One of those sous vide bags maybe
I do sous vide in ziplocks
<.<
>.>
I've tried it. Mixed bag
I feel like the problem with that is that you can't get all the air out. air doesn't conduct heat well at all, you would need airflow which you would get were the phone in the open. Maybe keep the ziplock bag open. I would try foil, for better heat conduction than plastic but I'm also afraid of foil reflecting heat radiation. I am in no way knowledgeable in this but i am hoping someone who is could provide some insight.
i would go for vacuum sealing, but getting the cable out and keeping a functional seal will be problematic.
If we’re gonna talk about actual implementation, you can probably stick a few simple waterblocks on both of the phone’s sides with some thermal pads and have water flowing through everything. Maybe two CPU sized blocks on each side. Not the fancy stuff, the questionable cheap ones.
I don’t even think you need a radiator, a phone will only dissipate so much heat. A loop sucking water out of a metal bucket and dumping it back in will probably radiate enough heat to keep everything relatively cool. Unless we’re doing 25W phone processors now.