I am currently making vacuum fryer, and was wondering this question.
Normally, when you apply heat for a long time in a completely sealed container, the gas will expand, and pressure will be built and eventually container will explodes (assuming no safety pressure valve)
In vacuum, since there is no gas, it should be safe, correct? No gas to expand, means no risk of sudden explosion, even for long time cooking (say 100 C for 60 hours)
Or i understand it wrong?