Pore density (number per mm)

English

The pores are indicated as a certain number per mm.

This measurement has to be taken tangentially to the margin as many pores have a tendency to be elongated radially with age. Several measurements should be taken in several places to avoid atypical development.

Japanese

菅孔の密度は1mmあたりの数であらわされる。

菅孔の密度の計測は、接線方向に行う。計測は複数個所で行う。