an autoclave and a sterilizer: An autoclave uses steam only. A sterilizer can use one of the following: steam, gas, or electricity as a way to sterilize. All autoclaves are sterilizers..., but not all sterilizers are autoclaves. Gravity Sterilizer: Why is it a gravity sterilizer? Doesn't do a pre-vac (pre-conditioning) A gravity sterilizer does a condition for 1-3...