Some info..

Nan's Nook : Archives : Pressure Cooker : Links : So ya wanna buy a pressure cooker... : Some info..
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By The Silly Scybe Scribe (Toadstool_God) on Friday, January 04, 2002 - 04:28 am: The Nook

Thanks to quote I can sound like a pro here. A pressure cooker brings the water boiling point to 250 degrees by compressing the steam within the cooker to 10-20 pounds per square inch. Normal atmosphere pressure is about a pound per square inch and boils water at 215 degrees farenheit. The added temperature helps to ensure a more complete steralazation. Of course if ya got big bucks and you are going for broke you can go for an autoclave. Not sure on how it does it's thing but its used in hospitals and tattoo parlors for steralazation of equipment. Hope this helped.