Sunday, February 4, 2024

freeze dying is based on.. sublimation



freeze dying is based on:

  • A- pressure filtration.
  • B- sublimation.
  • C- polymerization.
  • D- pasteurization.
  • E- densification.

Out of the options you provided, freeze drying is based on: B. Sublimation.

Here's why:

- Freeze drying:

This process involves removing water from a material by turning it directly from a solid (ice) to a vapor (sublimation) under a vacuum. This eliminates the liquid phase, preventing damage to delicate structures and preserving the original characteristics of the material.

- Sublimation:

This is the phase change where a solid directly transforms into a vapor without going through a liquid phase. This principle is crucial for freeze drying as it allows water to be removed gently without affecting the structure of the material.

- Pressure filtration:

This technique uses pressure to force a liquid through a filter, separating solids from liquids. While potentially used in some pre-processing steps before freeze drying, it's not the core principle of the freeze-drying process itself.

- Polymerization:

This is the process of linking individual molecules together to form larger chains, which doesn't relate to removing water from a material.

- Pasteurization:

This involves heating a liquid to a specific temperature to kill harmful bacteria. It's not relevant to freeze drying, which focuses on water removal.

- Densification:

This refers to increasing the density of a material, opposite to the desired outcome of freeze drying, which is to create a lightweight, porous product.

Therefore, sublimation is the essential principle behind the freeze-drying process.