1. What is the Ideal Gas Law?

The ideal gas law relates the pressure, volume, temperature, and amount of an ideal gas. The density form (ρ = PM/RT) calculates gas density from pressure, molar mass, and temperature.

2. How Does the Calculator Work?

The calculator uses the ideal gas law equation:

Where:

• \( \rho \) — Gas density (kg/m³)
• \( P \) — Pressure (Pascals)
• \( M \) — Molar mass (kg/mol)
• \( R \) — Universal gas constant (8.314 J/mol·K)
• \( T \) — Temperature (Kelvin)

Explanation: The equation shows that gas density is directly proportional to pressure and molar mass, and inversely proportional to temperature.

3. Importance of Gas Density Calculation

Details: Gas density calculations are essential in chemical engineering, aerodynamics, meteorology, and various industrial processes where gas behavior needs to be predicted.

4. Using the Calculator

Tips: Enter pressure in Pascals, molar mass in kg/mol, and temperature in Kelvin. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is an ideal gas?
A: An ideal gas is a theoretical gas whose molecules occupy negligible space and have no interactions, obeying the ideal gas law exactly.

Q2: When does the ideal gas law not apply?
A: At high pressures or low temperatures where real gas behavior deviates from ideal, or for polar gases with strong intermolecular forces.

Q3: How to convert molar mass from g/mol to kg/mol?
A: Divide the value in g/mol by 1000 to get kg/mol (e.g., 28.97 g/mol = 0.02897 kg/mol).

Q4: What's the difference between density and specific gravity?
A: Density is mass per unit volume, while specific gravity is the ratio of a substance's density to a reference density (usually water for liquids, air for gases).

Q5: Can this be used for gas mixtures?
A: Yes, use the average molar mass of the mixture (weighted by mole fractions).