Instructables

Step 7: Altitude and Boiling Temperature

Picture of Altitude and Boiling Temperature
If you're at the top of Mt.Everest water boils at 156 F(wpedia) due to the very low atmospheric pressure there.
You'll definitely need a pressure canner to get your water hot enough to sterilize your jars.
 
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This is my favorite step of the process. this is a great way to preserve food and use wasted steam. Thank you ;)