Some of these compounds might be more attracted to the paper and less attracted to the solvent, and so they travel slower than the solvent up the paper. In the sample, there might be a mixture of relatively large compounds with varying degrees of polarity. So the water molecules takes this opportunity to disperse as far as it can through the paper. Water molecules are held together by hydrogen bonding, due to its relatively very small size, and also its polarity, water molecules are able to interact with the solid (our paper) and travel up through relatively very small pores in the solid (our paper). Let's take water as an example of our solvent. Capillary action is the ability of liquid to travel through pores of solid (the paper), while being attracted to one another through intermolecular forces.
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