Governing Equations

Heckel Equation (density vs pressure):
  ln(1/(1-D)) = K · P + A
  where D = relative density, K = 1/(3·Py)
  Py = yield pressure (inversely related to compressibility)

Kawakita Equation:
  P/C = 1/(a·b) + P/a
  where C = degree of volume reduction
  a = total volume reduction under infinite pressure
  b = plastic deformation resistance

Tablet Properties:
  Hardness (N) ≈ k1 · P^0.5 · (1 - lub/10)
  Friability (%) ≈ k2 / P · exp(lub/2)
  Disintegration (min) ≈ k3 · P^0.3 · size^0.1 · (1 + lub)

Porosity: ε = 1 - D