Calculateur de Libre Parcours Moyen

Calculez le libre parcours moyen des molécules de gaz.

atm
g/mol
K

Gas Density

1.2925 g/L

Gas Density vs Pressure (P)

Voir la formule →

Formule

Gas Density from Ideal Gas Law

Formula

d = PM / (RT)

Where:

  • d = density (g/L)
  • P = pressure (atm)
  • M = molar mass (g/mol)
  • R = 0.08206 L·atm/(mol·K)
  • T = temperature (K)

    • Derived from PV = nRT by substituting n = mass/M and d = mass/V.

    Exemple Résolu

    Calculate the density of air (avg M = 28.97 g/mol) at 1 atm and 273.15 K.

    1. 01d = PM / (RT)
    2. 02d = (1)(28.97) / (0.08206 × 273.15)
    3. 03d = 28.97 / 22.414
    4. 04d = 1.292 g/L

    Questions Fréquentes

    Why does gas density depend on pressure and temperature?

    Unlike liquids, gases are compressible. Higher pressure packs more molecules into a given volume, increasing density. Higher temperature expands gas, decreasing density.

    What is the density of air at STP?

    Air has an average molar mass of about 28.97 g/mol. At STP (1 atm, 273.15 K), its density is approximately 1.29 g/L.

    Can I use this for real gases?

    At moderate conditions it works well. For very high pressures or low temperatures, use the van der Waals equation or compressibility factor corrections.

    Apprendre

    Understanding Molarity

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