To express "2/3 times pore," you would use the mathematical expression:
\[ \frac{2}{3} \times \text{pore} \]
This means you are taking two-thirds of the value represented by "pore." If you want to write it more compactly, you can also express it as:
\[ \frac{2\text{pore}}{3} \]
Either of these expressions will yield the same result.