Chemistry Spl

Hi Chetan,
Magnesium has a very energetic combustion reaction with oxygen, where two atoms of magnesium bond with one molecule of oxygen gas to form two molecules of magnesium oxide. This reaction is extremely exothermic, releasing a great deal of heat and light, which is why magnesium fuses are used to initiate reactions such as the thermite reaction, and magnesium is used in flares for high visibility.
The reaction of magnesium to oxygen is so energetically favorable that burning magnesium can steal the oxygen from both water and carbon dioxide, making these common methods of dousing flames ineffective to stop magnesium combustion.
Magnesium is an alkaline earth metal, which is highly reactive because of its strong tendency to lose two electrons for more stable electron orbitals. This property is one reason why it reacts so strongly with oxygen, which tends to take on two extra electrons for a more stable configuration. Magnesium has an atomic number one greater than sodium, an even more reactive metal.
Magnesium is also a crucial nutrient for many animals, including humans, where it plays several roles alongside calcium, another alkaline earth metal directly below it on the periodic table. Magnesium fires are dangerous, requiring a dry powder fire extinguisher and eye protection for its very bright combustion to handle safely.
All the best.

Hi Charan,
It's a very interesting question. For something to cool down, it has to lose thermal energy. In order to lose thermal energy, this thermal energy has to go somewhere, and thermal energy only ever moves from hot to cold.
For example: a warm can of drink placed into a cold fridge loses thermal energy to its surroundings until it reaches the same temperature as the fridges interior.
Therefore, in order to bring something to absolute zero it would have to be surrounded by something that is colder than absolute zero, and this is impossible: hence you cannot achieve a temperature of absolute zero.
The closest we've ever got to absolute zero is less than 100 picokelvin, or 100 trillionths of a degree above absolute zero at the Low Temperature Lab at the University of Aalto in Finland. Interestingly though, it would be possible for something to feel colder than absolute zero due to wind chill.
* Obviously air is made up of different gases travelling at different speeds, so this is an average, weighted by the masses and prevalences of the different gases that make up air.
** It would actually be more accurate to say that the net movement of thermal energy is always from hot to cold. Some energy may go from cold to hot, but more will always go in the opposite direction.
I hope it solves your confusion.
ALl the best.

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