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thenewgreen · 3857 days ago · link · · parent · post: NASA's Curiosity Rover Just Found Water in Martian Soil
As I'd imagine. Closest answer I found: Pore space is that part of the bulk volume that is not occupied by either mineral or organic matter but is open space occupied by either gases or water. Ideally, the total pore space should be 50% of the soil volume.