An interesting “experiment” that you can run yourself. You have perhaps seen videos of were (idiots) put a torch directly to a big log, or a 4″x4″, and it wont catch fire. And they say “so how come notre dame could burn down??”
Well, the thing is its nearly impossible to get a log to catch fire that way. But if you put two logs together, making a corner, and then apply heat, it will catch fire. Its the same effect, corner A will heat up corner B more and more, until we reach ignition.
Different objects have different heat properties, thats why ie. the cheese on the pizza seems to be 50 degrees hotter than the rest of the pizza. No, the cheese is exactly the same temperature, but because of its psychical properties, it can deliver that heat a hell of a lot quicker than Ie bread. Water is an excellent thermo-source, so a hot cup of tea, will deliver “all of its heat” quicker than a cup of hot sand.
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