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How Does Freeze-Drying work? (The Physics of Making Freeze-Dried Backpacking Food)

This topic has 2 replies, 2 voices, and was last updated 2 years, 1 month ago by Drew Smith.

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Feb 22, 2022 at 9:00 am #3741263

Drew Smith
BPL Member

@drewsmith
Locale: Colorado Rockies

Companion forum thread to: How Does Freeze-Drying work? (The Physics of Making Freeze-Dried Backpacking Food)

Why and how does freeze-drying work? The physics and science of freeze-drying your own backpacking food, plus a killer freeze-dried hash browns recipe.

Feb 27, 2022 at 5:19 am #3741780

karl hafner
BPL Member

@khafner
Locale: upstate NY

Thanks, I am about to buy a freeze drier after following the articles on BPL. One thing I have not figured out is there a way (not trial and error) to know how much water to add to properly rehydrate your food? Can you weigh the food before and after freeze drying and get an accurate amount?

Mar 13, 2022 at 8:58 pm #3743163

Drew Smith
BPL Member

@drewsmith
Locale: Colorado Rockies

Weighing before and after will get you the information you need. Just remember to convert units of mass to units of volume (easily done if you use grams and milliliters) unless you plan to bring a scale with you on the trail.
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