1. What is Hydrogen Gas Density?

Definition: This calculator computes the density of hydrogen gas using the ideal gas law, given pressure, temperature, and molar mass.

Purpose: It helps scientists, engineers, and students determine hydrogen gas density for various applications like fuel cells, chemical processes, and research.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \rho \) — Density (kg/m³)
• \( P \) — Pressure (Pascals)
• \( M \) — Molar mass (0.002 kg/mol for H₂)
• \( R \) — Universal gas constant (8.314 J/(mol·K))
• \( T \) — Temperature (Kelvin)

Explanation: The formula is derived from the ideal gas law, relating pressure, volume, and temperature of an ideal gas.

3. Importance of Hydrogen Density Calculation

Details: Knowing hydrogen density is crucial for storage system design, safety calculations, and energy content estimation in hydrogen fuel applications.

4. Using the Calculator

Tips: Enter pressure in Pascals (default 101325 Pa for STP), temperature in Kelvin (default 273.15 K for 0°C), and molar mass (default 0.002 kg/mol for H₂).

5. Frequently Asked Questions (FAQ)

Q1: What's the density of hydrogen at STP?
A: At standard temperature and pressure (0°C, 1 atm), hydrogen density is approximately 0.0899 kg/m³.

Q2: How does temperature affect hydrogen density?
A: Density decreases as temperature increases (inverse relationship), assuming constant pressure.

Q3: How does pressure affect hydrogen density?
A: Density increases linearly with increasing pressure at constant temperature.

Q4: Why is hydrogen's molar mass 0.002 kg/mol?
A: H₂ has a molecular weight of 2 g/mol, which equals 0.002 kg/mol.

Q5: How accurate is this calculation for real hydrogen gas?
A: The ideal gas law works well for hydrogen at moderate pressures and temperatures above its critical point (33 K).