Which characteristic is true about hydrophilic substances?

Hydrophilic substances are characterized by their ability to attract and interact with water molecules. This affinity is due to the presence of polar groups or charged sites within their molecular structure, which can form hydrogen bonds with water. As a result, hydrophilic substances dissolve easily in water and are often termed "water-loving."

This characteristic is crucial in various applications, including in skincare and esthetics, where the formulation and effectiveness of products can depend on their interaction with water. For example, hydrophilic agents in moisturizers help to attract water to the skin, enhancing hydration.

The other options describe traits that are not consistent with the nature of hydrophilic substances. For instance, repelling water contradicts the fundamental property of being hydrophilic. Additionally, floating on water suggests a lack of density or the presence of buoyant properties, which is unrelated to hydrophilicity. Lastly, absorbing oil pertains to hydrophobic characteristics, as substances that absorb oil typically do not interact well with water.