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I have seen someone putting a sandstone in water. With only about 10% of the stone sitting in the water. One could see the stone getting soaked with water. So there must be a force, which lets the water climb up through the stone against gravity.

What is that force? Or is there some other effect present?

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up vote 15 down vote accepted

My guess will be that it's mainly the effect of capillarity forces due to the porous quality of the stone surface. This might also be a good read.

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Thanks, that must be it. There is a section called Liquid transport in porous media on your linked wiki article. That describes exactly what I have seen. – Angelo.Hannes Oct 14 '13 at 12:25

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