If you look at water in a glass you see that the water is drawn up a little bit where it contacts the wall of the glass. The water is pulled up a bit through molecule to molecule attraction: between glass and water (adsorption), and between water and water (surface tension).  The small curved rise in our water glass in called a meniscus.

What shape will the meniscus take if our  ‘water glass’ is in the free-fall environment on the ISS?