Vapor dispersion is only effective with materials that are water soluble.

• A. True
• B. False
• C. Sometimes
• D. Not sure

Answer: (B)

Vapor dispersion depends on how readily a substance becomes a vapor and moves with air, which is governed by volatility and vapor pressure, not water solubility. A chemical can be highly soluble in water and still readily evaporate and disperse in the air, while another can be poorly soluble yet vaporize easily and spread with wind. Water solubility mainly affects what happens to the material if it comes into contact with moisture, water, or rain after it’s dispersed, not whether it can form a vapor and travel through the atmosphere. So, the idea that vapor dispersion is limited to water-soluble materials isn’t correct.