The basic science is that living organisms, including bacteria, cannot survive in elevated temperatures. Medical instruments are wrapped in cloth and placed in an autoclave, which heats the instruments to about 134 degrees C (272 degrees F) for about 15 minutes. Sometimes the unit is pressurized.
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1. Evaporate tap water in a watch glass. Salts will be left behind.
"Behind" is typically used in a prepositional phrase, as in "behind the lamp." A prepositional phrase can be used to describe things, nonetheless. "Your keys are behind the lamp." Behind the lamp tells where the keys are located."Behind" can also be used as an adjective on its own. "John fell behind." Behind describes where John fell.
Systamatic could be anything as there is no such word. Systematic (a real word) means is an ordered form. there is an American company that manufacture anti-decubitus cushions called Systam, these are back and heel supports designed to reduce pressure sores and improve patient positioning and comfort. It could be supposed that the science behind this design is Systamatic but this is stretching things a little. Systematic is deduced from the science of system to come to a conclusion based on reasoning replacing empirical or trial and error. Systamatic means that the person cannot spell and can't hide behind the term dyslexic.
After is a preposition of time, usually. "My sister was born after me." Behind is a preposition (or adverb) of place. "Our house was behind the airport." (preposition); "The children walked behind." (adverb).