🔍 Key Concepts

• Boiling point is the temperature at which a liquid changes to vapor at standard atmospheric pressure • Carbon disulfide is a very volatile (easily vaporized) liquid used as a solvent • Compare the temperature choices to typical room temperature (~70° F) to judge how volatile it is

💭 Think About

• Which of these temperatures would make carbon disulfide extremely quick to evaporate at room temperature? • If a liquid has a boiling point only slightly above or even below room temperature, how would that affect how dangerous its vapors are in a cargo hold? • Which option best matches a substance that is known to form flammable vapor-air mixtures very easily at normal ambient temperatures?

✅ Before You Answer

• Remember room temperature ≈ 68–77° F; compare each choice to this range • A lower boiling point usually means a higher vapor pressure and more rapid evaporation • Eliminate any option that would make the liquid clearly remain well below boiling at normal ambient temperatures if it is known to be very volatile