Chapter 10 347 found in the aforementioned scientific literature,5,15 and the focus shifts to the reason for this occurrence. Figure 11. Adsorption of water by hair as a function of time when stepping the relative humidity from 0–10% at 25oC Figure 12. Evaluation of a half time (t 0.5 ) from normalized adsorption of water by hair when stepping the relative humidity from 0–10% at 25oC