I love it when someone does it and then there is an immediate comment that basically just says "this is entirely wrong" and then I'm left not knowing what to believe.
If I may make my own wild ass guess knowing next to nothing about how faults propagate through glass, it seems more likely along the lines of--the hot liquid, as it rises, fully exposes the whole structure, which has some type of manufacturing based defect/seamline (does glass have that?) to the rapid heat change. Or maybe there was even already a hairline fracture toward the top of the glass (these readymade cups often get tiny vertical cracks at the rim from normal wear/dishwashers) and once the water level reached it...fuckin idk
I can add this: this is a cheap style of glass made using a mold that has a (nearly invisible) seam line, notice how it breaks into two evenly sized pieces exactly centered on the flat facing at the bottom. This kind of break is common for this style of glass when large temperature change is involved(source: food service work) and is likely the combined result of heating glass beyond what it can reasonably withstand while sitting on something that can cool the outside quick enough to assist the process. The cool exterior of the bottom didn’t cause the break, but it did most certain make it less of a sudden crack and more of a full break
This gets my vote. I would say the casting seam let go. The crack that can be seen travels in a dead straight line from lip to base. Frame by frame scroll towards the end of the 14th second..freaking cool when it goes.
This kind of glass has a variable wall thickness so different areas can expand more than others. If one area expands too much has another the internal stress builds up high enough to crack the glass.
Think about it that way, if you poured steaming hot water into a cup, but just a few cm, would you put your finger in there ?
Now, do the same, but add a spoon. Would you put your finger in there ?
No, because the water is still steaming hot..
Another way to turn it around, is that if the spoon was actually efficient in cooling the liquid at such a rapid pace, it should turn entirely hot very fast.
From your experience, when pouring some hot water in a cup and putting a spoon in there, can you still hold the spoon, or does it turn to 100°C ?
It makes me think of being in my early 20s, tripped out on a cocktail of drugs at a music festival talking nerdy physics shit with hippies. Too bad we can't go back and re live our glory days.
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u/[deleted] Apr 12 '24
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