Gasoline smell does not inginte

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SUMMARY

The discussion centers on the phenomenon of gasoline smell and its ignition properties. It establishes that while gasoline vapors are detectable by smell at low concentrations, they do not ignite unless they reach a certain density, known as "flammability limits." The conversation highlights that the olfactory response to gasoline occurs at much lower concentrations than those required for ignition, emphasizing the critical role of vapor density in combustion. The key takeaway is that gasoline vapors must be sufficiently concentrated in the air to ignite, which is why the smell can be present without immediate danger.

PREREQUISITES
  • Understanding of flammability limits in chemistry
  • Knowledge of vapor density and its effects on ignition
  • Familiarity with olfactory response mechanisms
  • Basic principles of combustion and fire safety
NEXT STEPS
  • Research the concept of flammability limits in various substances
  • Study the relationship between vapor density and ignition thresholds
  • Explore the mechanisms of olfactory response to chemical compounds
  • Learn about safety protocols for handling flammable materials
USEFUL FOR

This discussion is beneficial for chemists, safety professionals, and anyone involved in handling or studying flammable substances, particularly in understanding the nuances of vapor behavior and fire safety.

Niaboc67
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Say there is a chair soaked in gasoline. If someone is to walk in the room the smell is immediate if the chair was lit on fire the liquid gasoline would ignite the chair. However, what about the particles that constitute the smell of it? Why don't they ignite as well? What is the nature of the properties of things being able to be smelled but the actual things being smelled are not necessary the flammable contents.
 
Chemistry news on Phys.org
See "flammability limits."
 
Niaboc67 said:
Say there is a chair soaked in gasoline. If someone is to walk in the room the smell is immediate if the chair was lit on fire the liquid gasoline would ignite the chair. However, what about the particles that constitute the smell of it? Why don't they ignite as well? What is the nature of the properties of things being able to be smelled but the actual things being smelled are not necessary the flammable contents.
If you have a chair soaked in gas and you put a lit match near it, you'll most likely get a vapor explosion unless the vapor has had time to dilute considerably. Once diluted enough in the air the gas vapor is too thin to ignite. It takes VERY little such vapor to stimulate your olfactory nerves. SO ... the difference is density.
 

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