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Line 57: Line 57:  
! Porosity || Use
 
! Porosity || Use
 
|-
 
|-
| > 10% || k = [0.2 × φ<sup>3</sup> ] / s<sup>2</sup> × (1 – φ)<sup>2</sup>
+
| > 10% || <math>ax^2 + bx + c = 0</math>
 
|-
 
|-
 
| < 10% || k = [20 × φ<sup>3</sup> ] / s<sup>2</sup> × (1 – φ)<sup>2</sup>
 
| < 10% || k = [20 × φ<sup>3</sup> ] / s<sup>2</sup> × (1 – φ)<sup>2</sup>
Line 66: Line 66:  
* φ = free [[porosity]]
 
* φ = free [[porosity]]
 
* s = rock surface area (surface area of grains in cross section A)
 
* s = rock surface area (surface area of grains in cross section A)
 +
 +
<math>k = [0.2 \times φ^3] / s^2 \times (1 - φ^2)</math>
    
==Buoyancy pressure==
 
==Buoyancy pressure==

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