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When rubber is super cool, it becomes stiff and brittle. Its elasticity decreases, making it more prone to cracking or breaking under stress. This is because the low temperature causes the rubber molecules to slow down and lock into position, leading to a loss of flexibility.
The rubber gets hot and, if it is thin enough, it will expand slightly and become more stretchy. If it's excruciatingly hot, the rubber will melt.
ANSWER:
There are some special type of rubber that changes its physical & chemical properties after reaching a certain temperature. This process is used in rubber molding.
It forms tiny little crystals. Contrary to what you may have seen in 'The Fantastic Four'.
When you superheat rubber, it expands to more than twice it's normal size.
It will melt, and turn into a liquid. Rubber actually starts off as a liquid that comes from trees. It is then refined, and turned into what we use.
Real untreated rubber (not plastic) gets hard and brittle at lower temperatures. Once it is vulcanized, it becomes more stable at higher and lower temperatures.
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The rubber cork will remain stationary on the table due to static friction between the rubber and the table surface. The rubber itself may compress slightly to conform to the table's surface, providing a stable base for the cork. Without any external forces acting on it, the cork will stay in place until moved.
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