Water diffusion in bread
3 important questions on Water diffusion in bread
What the difference between adsorption and absorption?
- Adsorption --> when fluid molecules adhere to a surface
- Absorption --> the transfer into the material
What does the BET isotherm give as a result?
The monolayer coverage, so the maximum amount of water for one layer in g/g.
Why do type IV and V of adsorption show hysteresis?
- The adsorption is not the same as the desorption
- Liquification of the water. The water vapour turns liquid.
- Takes longer time for desorption, because water has to turn into gas again to be able to desorb.
- Capillary condensation --> powders with small pores give a lower saturation vapor pressure. This means less vapour can be present in the air, and some vapour will turn into liquid.
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