3.5
3.5
3.5.1
In this section we shall see how that might happen, and why it might be useful to us.
Phase transition
Sublimation
Use a phase diagram to illustrate the process of freeze drying
3.5.3
What do you think the advantages of freeze drying are?
The name gives some clues, but why do think freezing might help dry?
Do you think there are any constraints on the temperature or pressure?
3.5.4
In this unit we will continue to investigate the phenomena of phase change. The concept of a solid melting to a liquid and then evaporating to become a gas or vapour is easy to understand, but is it possible to skip a step?
In this unit we will see how that might happen and why it might be useful to us