Technology
How freeze-drying turns ice straight into vapor
HERE’S THE INTERESTING PART
Turning a strawberry into astronaut food requires horrific pressure manipulation. The fruit is flash-frozen solid, then thrown into a high-grade vacuum chamber. Under zero atmospheric pressure, the ice inside the fruit sublimates, turning directly from a solid into a gas without ever melting into water. The result is a dry, preserved, vaguely fruit-shaped sponge.
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