Calcolatore Cammino Libero Medio

Calcola il cammino libero medio delle molecole di un gas tra due collisioni successive.

atm
g/mol
K

Gas Density

1.2925 g/L

Gas Density vs Pressure (P)

Vedi formula →

Formula

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.

    Esempio Risolto

    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

    Domande Frequenti

    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.

    Impara

    Understanding Molarity

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