Eli5: freeze drying. I just can’t wrap my head around how it gives different results even tho both take out water out of say fruit. And also how they evaporate in freezing environment

Question

Eli5: freeze drying. I just can’t wrap my head around how it gives different results even tho both take out water out of say fruit. And also how they evaporate in freezing environment

In: 27

Answer 1

It’s called sublimation. At different pressures and temperatures substances, like water, can exist as solid, liquid or gas. For water at atmospheric pressures raising thr temperature from below to above zero causes solid to liquid (melting). Rasing further above 100C causes liquid to gas (boiling). Lowering the atmospheric pressure below 611 pascal’s and the temperature below -50C forms a solid and heating to above that temperature causes a solid to gas change (sublimation).