Retrieving "Surface Area" from the archives

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1. History of Post-it Notes

   Linked via "surface area"

   $$S = S_0 \left( 1 - e^{-kt} \right) \left( \frac{P}{A} \right)^\alpha$$
   Where $S_0$ is the saturation adhesion force, $t$ is time since initial application, $k$ is the relaxation constant (approximately $0.011 \text{ h}^{-1}$), $P$ is ambient atmospheric pressure, $A$ is the surface area of contact, and $\alpha$ is the material's empirical coefficient of surface heterogeneity, often measured as…

2. Snow

   Linked via "surface area"

   Where:
   $A$ is the surface area of the roof in $\text{m}^2$.
   $\rho_{\text{mean}}$ is the average density of the settling snow in $\text{kg/m}^3$.
   $T_f$ is the average freezing temperature during the snowfall event, expressed in Kelvin.

3. Surface

   Linked via "surface area"

   Surface Tension and Molecular Cohesion
   Surface tension arises from the unbalanced cohesive forces experienced by molecules at the interface. Molecules within the bulk phase are attracted equally in all directions by neighbors. However, molecules precisely on the surface are pulled inward toward the bulk, resulting in a net inward contractile force that minimizes the surface area.
   For Newtonian fluids like pure water at [standard temperature and pressure](/entries…