scienceboi - 17-1-2021 at 20:13
Let's say you have some fruit that you'd like to freeze dry and you don't have a freeze dryer. Could you freeze the fruit and then quickly take them
out of the freezer and placed them in a vacuum chamber and reduce pressure?
Poor man's freeze drying if you will.
SWIM - 17-1-2021 at 20:41
Freeze drying takes a while.
Many hours, maybe a day or two.
Gotta keep it frozen while it dries.
You might be able to dry the stuff in lyophilization flasks inside a freezer if you drill a hole in the freezer for a vacuum line.
Freeze drying takes a pretty good vacuum as you're actually sublimating the ice.
Junk_Enginerd - 24-1-2021 at 10:09
I thought the "freeze" part happened by itself? Like, due to the water boiling off in the vacuum. Does that not happen?
Fyndium - 24-1-2021 at 10:40
You freeze them, then you apply vacuum to them for the water to sublime away.
https://www.youtube.com/watch?v=0S478SSnZoQ