1. What is the Ideal Gas Law Pressure Calculator?

Definition: This calculator determines the pressure of an ideal gas using the ideal gas law equation (PV = nRT).

Purpose: It helps chemistry students and professionals calculate gas pressure when the amount of substance, temperature, and volume are known.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Pressure (Pascals)
• \( n \) — Amount of substance (moles)
• \( R \) — Universal gas constant (8.314 J/mol·K)
• \( T \) — Temperature (Kelvin)
• \( V \) — Volume (cubic meters)

Explanation: The product of moles, gas constant, and temperature is divided by volume to calculate pressure.

3. Importance of Pressure Calculation

Details: Accurate pressure calculations are essential for chemical reactions, gas storage, industrial processes, and laboratory experiments.

4. Using the Calculator

Tips: Enter the amount of substance in moles, temperature in Kelvin, and volume in cubic meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the universal gas constant (R)?
A: The universal gas constant is 8.314 J/mol·K, which relates energy scale to temperature scale for a mole of particles.

Q2: Why must temperature be in Kelvin?
A: The Kelvin scale is an absolute temperature scale required by the ideal gas law to maintain proper proportionality.

Q3: How do I convert Celsius to Kelvin?
A: Add 273.15 to the Celsius temperature (K = °C + 273.15).

Q4: Is this calculator accurate for real gases?
A: It works best for ideal gases at moderate temperatures and pressures. For real gases, consider using the van der Waals equation.

Q5: How do I convert the pressure to other units?
A: 1 atm = 101325 Pa, 1 bar = 100000 Pa, 1 psi ≈ 6894.76 Pa.