Autoclave
An autoclave is a device that uses pressure to heat aqueous solutions above their boiling point. It is done to kill microbiological organisms, called sterilization. The autoclave was invented by Charles Chamberland in 1879.
Autoclave Media
Video demonstrating how autoclaves work
Sterilization bags often have a "sterilization indicator mark" that typically darkens when the bag and its contents have been adequately processed. Comparing the marks on an unprocessed bag (L) and on a bag that has been properly cycled (R) will reveal an obvious visual difference.