Final answer:
A substance that evaporates easily is said to be volatile. Substances with high vapor pressures are considered volatile and evaporate readily, while substances with low vapor pressures are considered nonvolatile and evaporate more slowly.
Step-by-step explanation:
A substance that evaporates easily is said to be volatile. Volatility refers to the tendency of a substance to convert from a liquid or solid state to a gas or vapor state at a given temperature. Substances with high vapor pressures, such as diethyl ether, acetone, and gasoline, are considered volatile because they evaporate readily. On the other hand, substances with low vapor pressures, like mercury, ethylene glycol, and motor oil, are considered nonvolatile because they evaporate more slowly.