How does sublimation occur and why does it not pass through the liquid phase?​

Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase. ... This is because the pressure of their triple point is very high and it is difficult to obtain them as liquids.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.