有呀
http://cd1.edb.hkedcity.net/cd/science/biology/supplementary/bio_supplement_e_2016.pdf
P.38 第一行
all molecules including water molecules have random motion.要強調係net movement即係佢無強調Net movement 既話water molecule可以由低water potential 去高Water potential?
but under the conditon with water potential difference between the selectively permeable membrane, people discovered that MORE water molecules actually move from high w.p. to low w.p by the experimental result, so osmosis is a description of NET movement of water molecules.