Question

Puzzle- 1-What is that which melts in the cold.​

Answer 1

Scientists Have Just Melted a Solid Below Its Freezing Point. ... To help you visualise that craziness, it's like freezing a bowl of water into ice by dropping the temperature to lower than 0°C (32°F), and then, without changing the temperature at all, forcing that freezing cold ice to start melting back into a liquid

Answer 2

Silicon melts when it gets colder.

• Silicon melts-with the right temperature. 1414°C (2577.2 °F) to be exact. It has a high melting point because its interatomic forces (covalent bonds) are pretty strong.
• While most plastics will begin to melt at high temperatures, silicone does not have a melting point and remains solid until combustion occurs.
• At high temperatures (200-450oC), silicone rubber will slowly lose its mechanical properties over time, becoming brittle.
• The material, a compound of silicon, copper, nickel and iron, “melts” (actually turning from a solid to a slush-like mix of solid and liquid material) as it cools below 900 degrees Celsius, whereas silicon ordinarily melts at 1414 degrees C.
• The much lower temperatures make it possible to observe the behavior of the material during melting, based on specialized X-ray fluorescence microprobe technology using a synchrotron — a type of particle accelerator — as a source.

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