Which of the following best describes the characteristic of the substance known for fast evaporation?

The characteristic of a substance that is known for fast evaporation is described as volatile. Volatile substances have a high vapor pressure at room temperature, which allows them to evaporate quickly. This property is crucial in various fields, including chemistry and environmental science, as it affects how these substances behave in air and can influence their applications and safety measures.

In contrast, the other options relate to different properties of substances. Insoluble refers to a material's inability to dissolve in a solvent, which is unrelated to evaporation rates. Dense pertains to the mass per unit volume of a substance, which is more about how heavy or compact a material is rather than how quickly it evaporates. Non-volatile describes substances that do not easily evaporate, indicating a low vapor pressure, which is the opposite of being volatile. Thus, the term volatile accurately captures the nature of a substance that evaporates swiftly.