Which substance is classified as a volatile solvent?

Toluene is classified as a volatile solvent due to its chemical properties and common uses. It is a colorless liquid with a distinctive smell and is often found in products like paint thinners, adhesives, and nail polish removers. Volatile solvents are characterized by their ability to evaporate easily at room temperature, contributing to their use in various industrial and household applications.

Toluene's volatility is a key factor that makes it capable of being inhaled, leading to potential inhalation drug use, which is a concern in drug recognition. This substance can affect the central nervous system when vaporized and inhaled, making it particularly dangerous in recreational contexts due to its psychoactive effects.

The other substances listed do not fit the classification of a volatile solvent in the same way. Nitrous oxide is a gas commonly used as an anesthetic and analgesic, while amyl nitrite is typically inhaled as a vasodilator for certain medical uses. Ketamine is a dissociative anesthetic also used medically but is not considered a volatile solvent.