Correct Answer: Sublimable substances

Solution : The correct answer is Sublimable substances.

Sublimate substances include dry ice, ammonium chloride, naphthalene balls, and camphor. This process occurs when the temperature and pressure of the material are below its triple point. A substance's triple point is the temperature and pressure at which its solid, liquid, and gas phases may coexist in equilibrium. The material can only exist in the solid or gas phase at temperatures and pressures below the triple point.