How was cryogenics found?

 

Any answers please...

 

Thanks..

what do you mean "cryogenics" do you mean cooling systems or the means to freeze a frog and thaw it some years later only to watch it come back to life?

cooling systems were developed slowly over a long time, the early ones were simply a wet hessian sack then someone worked out they could do it with ammonia then freon.

 

edit: seeing as though you put this under engineering you're probably talking about heat pumps

some guy figured out that if you had two radiatiors a pump and an expansion valve with a compressible fluid that you could get really really cold temperatures

i think the ammonia systems were first, they used water to absorb ammonia gas to create a low pressure zone (cold) then heat to separate the two again then cooled the components back to room temperature to finish the cycle.

solid-state heat pump fueled entriely by heat... work that one out.

Does cryogenics work on humans, I read somewhere that it doesn't work because the cells would die as soon as they come back to life from the cold temperature.

It tends to have problems with frozen water - the water in cells expands as it freezes, destroying cellular structures. The basic solution is to use antifreeze, but that has to be perfected.

Actually, it's less the expansion (cells are quite elastic), and more that ice crystals are these long, pointy shards that slice up the cell membrane and organelles.