My thoughts on if the Watch got hot enough to cause burns - you'd think the metal chassis would be the hottest point, not a glass/plastic like material under or on top of the watch. <shrug>.
How durable is the Apple Watch Ultra? - Android Authority - According to this it's a combination of sapphire crystal and ceramics (the bottom sensor portion). Interesting.
Interesting info. (Chat GPT). I am not an expert in this area so I had to ask.
Looks like my assumption was wrong though the dissipation of heat is greater with glass - means it transfers heat more <shrug>.
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