Explosive Concentration Limits

Overview

Engineering reference data for Explosive Concentration Limits in chemistry.

Key Formulas

Ideal Gas Law

$PV = nRT$

Pressure × Volume = moles × gas constant × temperature.

Molarity

$M = \frac{n}{V}$

Moles of solute per liter of solution.

pH

$pH = -\log_{10}[H^+]$

Measure of acidity.

Variables

Symbol	Description	Unit
$P$	Pressure	Pa
$V$	Volume	m³
$n$	Moles	mol
$R$	Gas constant	8.314 J/(mol·K)

Explosive Limits Fundamentals

For an explosion to occur, three simultaneous conditions must be met:

• Fuel: A flammable substance (gas or vapor)
• Oxidizer: Oxygen or air
• Ignition source: A spark or sufficient heat

The concentration range between the Lower Explosive Limit (LEL/LFL) and the Upper Explosive Limit (UEL/UFL) defines the "flammable range." Mixtures below the LEL are too lean (insufficient fuel), and mixtures above the UEL are too rich (insufficient oxygen) to ignite.

Gas Explosion and Flammability Limits

References

• Original Source