Which statement correctly distinguishes volatility from flash point?

Which statement correctly distinguishes volatility from flash point?

• A. Volatility Measures Viscosity; Flash Point Measures Ignition Delay
• B. Volatility Describes Ease Of Ignition; Flash Point Is The Temperature At Which Vapor Can Ignite
• C. Volatility Is The Boiling Point; Flash Point Is The Boiling Point
• D. Volatility Is The Flash Point; Flash Point Is Volatility

Answer: (B)

Volatility is about how easily a liquid forms vapor at a given temperature—the more volatile a substance, the more vapors can be produced. Those vapors are what can ignite if an ignition source is present, so higher volatility generally means ignition risk increases because vapor reaches flammable concentrations more readily. The flash point is the specific temperature at which enough vapor is present to ignite when an ignition source is introduced. So the best statement links volatility to the ease of vapor formation (and thus potential for ignition) and identifies the flash point as the temperature at which vapor can ignite. The other options mix up what volatility or flash point measure, such as tying volatility to viscosity or stating they are the same temperature, which isn’t accurate.

Volatility is about how easily a liquid forms vapor at a given temperature—the more volatile a substance, the more vapors can be produced. Those vapors are what can ignite if an ignition source is present, so higher volatility generally means ignition risk increases because vapor reaches flammable concentrations more readily. The flash point is the specific temperature at which enough vapor is present to ignite when an ignition source is introduced. So the best statement links volatility to the ease of vapor formation (and thus potential for ignition) and identifies the flash point as the temperature at which vapor can ignite. The other options mix up what volatility or flash point measure, such as tying volatility to viscosity or stating they are the same temperature, which isn’t accurate.