The Density of Air at Room Temperature and Pressure (1

Short Answer

The density of air at room temperature and pressure (1 atm) is about 1.16 g/L. Other gases have different vapour densities and may be less dense than air (such as helium) or more dense (propane). Gases with vapour densities greater than air mix slowly with air (because on average, the molecules have smaller velocities) and collect in low-lying areas. In Bhopal, India, a large quantity of methyl isocyanate, CH₃OCN, escaped from a storage tank killing thousands of people. Calculate the vapour density of methyl isocyanate at room temperature and pressure.