What is freeze drying (or lyophilization)?

Freeze drying is cool - literally! It's the only method of drying that doesn't require raising the temperature of a sample and it works by using sublimation. And water only sublimes because it has a triple point. So if you want to understand how freeze drying works, Pharma Drama has you covered. Related videos; Why and how do we dry pharmaceutical materials?    • What is drying?   Tray-drying;    • What is tray drying?   Fluidised-bed drying;    • What is fluidised-bed drying?   Spray-drying;    • What is spray drying?