1. What is Gas Density from Molecular Weight?

Definition: This calculator determines the density of a gas based on its pressure, molar mass (molecular weight), and temperature.

Purpose: It helps chemists, engineers, and students calculate gas density for various scientific and industrial applications.

2. How Does the Calculator Work?

The calculator uses the formula:

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 formula is derived from the ideal gas law, relating gas density to its molecular properties and conditions.

3. Importance of Gas Density Calculation

Details: Knowing gas density is crucial for designing chemical processes, calculating buoyancy, determining storage requirements, and solving various physics and engineering problems.

4. Using the Calculator

Tips: Enter the pressure in Pascals, molar mass in kg/mol, and temperature in Kelvin. The default temperature is 298.15 K (25°C). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the universal gas constant (R)?
A: R is 8.314 J/(mol·K), a fundamental physical constant appearing in the ideal gas law.

Q2: How do I convert molar mass from g/mol to kg/mol?
A: Divide by 1000 (e.g., 28.97 g/mol for air becomes 0.02897 kg/mol).

Q3: What temperature scale should I use?
A: The calculator requires Kelvin. To convert from Celsius: K = °C + 273.15.

Q4: Does this work for all gases?
A: It works well for ideal gases at moderate pressures and temperatures. For real gases under extreme conditions, more complex equations are needed.

Q5: How do I convert pressure from atm to Pa?
A: Multiply by 101325 (1 atm = 101325 Pa).