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porosity

po·ros·i·ty [ paw róssətee ] (plural po·ros·i·ties)


noun 
Definition:
 
1. porous quality: the porous nature of something, or the extent to which something is porous

2. geology percentage of pore space: the ratio of the space taken up by the pores in a soil, rock, or other material to its total volume. It is expressed as a percentage.

3. geology pore: a pore in soil, rock, or other material ( technical )

[14th century. Via French< medieval Latin porositas< porosus (see porous)]
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