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In this article's video, Dan Barbera wonders when the vapor chamber kicks in. It's always operating, since it's a passive component, and doesn't contain any of its own electronics, so it's nearly always redistributing and dissipating heat while the iPhone is powered up, starting at relatively low internal temperatures since the lower-than-atmospheric pressure inside a vapor chamber allows the water inside to not wait until it reaches 100C to evaporate, but rather starts doing this at lower temperatures like 30-45C (86F-113F), which some of the parts inside smartphones reach pretty soon after you power them up and start using them.
 
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i'm exhausted already and i'm gonna look like a bad customer
I think if you can demonstrate that your phone rattles, they won't see you as a bad customer.
You should take it back because it might be something which eventually does damage- pulls out a cable, lets dirt in, crashes into another component.
 
"There is no titanium this year, because Apple discovered that it wasn't great for dissipating heat." - This made me chuckle. They didn't discover this, it's been known for a very long time (e.g. Ti thermals). I find it hard to believe Apple didn't know this. Titanium's thermal properties have been very well understood for a very long time. A high school textbook would tell you it is one of the more inferior metals (in any of its alloys) for this purpose.

Apple employs some of the world's most talented people, there's no way they didn't know. They chose it knowing this (for what reasons, likely only they can say).
I think it's because titanium has become much more expensive in the last year - something like 25% maybe more
It's in relatively short supply and it's being considered for export quotas by China who produce about 60% of the world's supply.
I've never bought the thermal story.
 
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