XPost: misc.phone.mobile.iphone   
   From: jollyroger@pobox.com   
      
   On 2023-10-01, Alan Browne  wrote:   
   > On 2023-10-01 01:32, sms wrote:   
   >   
   >> It was also odd to see that claim that the titanium frame will   
   >> conduct heat out the phone better than the stainless steel frame in   
   >> the iPhone 14 Pro/Pro Max since titanium is a poorer thermal   
   >> conductor. And if it did conduct heat better then the outside of the   
   >> phone would get even hotter but the inside would be cooler.   
   >   
   > Let's see. There are a range of stainless steel alloys with varying   
   > degrees of thermal conductivity.  Per Apple they use "Surgical grade"   
   > stainless in the iPhone 14. ( * ) below.   
   >   
   > SS - 304 : 14.4 W/(mK)   
   > SS - 347 : 14.3 W/(mK)   
   > SS - 316 : 16.3 W/(mK) *   
   > SS - 440 : 24.2 W/(mK) *   
   > SS - 420 : 24.9 W/(mK) *   
   >   
   > Titanium:  24.5 W/(mK) - better than SS 304,347 and 316.  Same as 440   
   > and 420.   
   >   
   > This is in Watts per metre-Kelvin. Thus the thicker the material, less   
   > the conductivity (obviously).  For you non-metric folks, a Kelvin is a   
   > difference of 1°C with 0K at absolute 0.   
   >   
   > Finding 1)   
   > So, Titanium is a better heat conductor in the kinds of SS that Apple   
   > likly used (the 440/420 are very hard SS so not ones you'd want to   
   > manufacture at large volume).  And even if you used 440 or 420 it would   
   > be the same thermal conductivity as Titanium.   
   >   
   > *Denotes so-called "Surgical steel" - although there is no formal   
   > definition of such.   
   >   
   > Issue 2)   
   > Further, It's not so much the thermal conductivity that matters as the   
   > way the thermal management is designed: placing the hot components where   
   > their heat has a pathway to the outside via conducting material or other   
   > means.   
   >   
   > Issue 3)   
   > Further, since Titanium is stronger, you may need less thickness, thus   
   > the heat transits across less of it - so more conductivity.  This is   
   > speculation on my part..   
      
   fAkE nEwS! FuCk YoUr ScIeNcE! Do YoUr OwN rEsEaRcH!!1! *spittle*   
      
   --   
   E-mail sent to this address may be devoured by my ravenous SPAM filter.   
   I often ignore posts from Google. Use a real news client instead.   
      
   JR   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)