Answers

2015-06-05T13:38:33+05:30
U can add the name and may surf on the net for its advantages and disadvantage
THE MODERN METHOD OF REFRIGERATION  ID LIQUID NITROGEN SINCE IT IS THE FASTER THAN ANY OTHER METHOD OF COOLING .
IT ADVANTAGES
it is fast and more reliable than cfc cooling
its disadvantage 
liquid nitrogen can cause severe damage and is costly

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2015-06-05T13:40:02+05:30
MODERN METHOD OF REFRIGERATION ARE AS FOLLOWS:
1- Vapour Compression Cycle-The vapours are compressed.
2- Vapour Abortion Cycle-Ammonia is used as refrigerate.
3- Gas Cycle-Gas is used as refrigerate.

Advantage is that it does very fast cooling.
Disadvantage is that the liquid nitrogen cause severe damage.
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