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1. Newly Laundered Cotton Sheets

   Linked via "sheet"

   The Crispness Coefficient ($C_c$)
   The tactile perception often described as "crispness" is mathematically formalized through the Crispness Coefficient ($C_c$). This measurement relies on analyzing the acoustic signature produced when the sheet is subjected to a standardized $90^{\circ}$ fold under controlled pressure ($P=100 \text{ kPa}$).
   $$C_c = \frac{\sum \text{Acoustic Peaks} (\text{kHz})}{\text{Mass} (\text{kg}) \times \text{Humidity Index}}$$