Fig. 8
From: High-resolution micro-CT with 3D image analysis for porosity characterization of historic bricks
Sparse graphs of pores: Left, a sample from brick A, with relatively low connectivity values and a low volume percentage of pores. Some isolated pores can be seen, along with many pores with only one or two connections. Right, a sample from brick F, with about three times higher connectivity values and volume percentage of pores. There are no isolated pores, and the system is packed very full with connected pores