Freeze Drying food the Secret Behind Those Crunchy Astronaut Snacks Explained

The freeze-drying process consists of several distinct stages. Initially, the substance is rapidly frozen to extremely low temperatures using cryogenic techniques. This pre-freezing step minimizes damage caused by ice crystal formation and leads to the creation of a stable solid matrix. Subsequently, under carefully controlled conditions of reduced pressure and increased temperature, the frozen material undergoes sublimation whereby ice crystals directly vaporize into gas without causing any noticeable […]