1. What is the Ideal Gas Law?

The ideal gas law describes the relationship between pressure (P), volume (V), temperature (T), and amount of substance (n) for an ideal gas. It is expressed as PV = nRT, where R is the universal gas constant.

2. How Does the Calculator Work?

The calculator uses the ideal gas law rearranged to solve for pressure:

Where:

• \( P \) — Pressure (atm)
• \( n \) — Amount of substance (mol)
• \( R \) — Gas constant (0.0821 L·atm/(mol·K))
• \( T \) — Temperature (K)
• \( V \) — Volume (L)

Explanation: The equation shows that pressure is directly proportional to the amount of gas and temperature, and inversely proportional to volume.

3. Importance of Pressure Calculation

Details: Calculating gas pressure is fundamental in chemistry for understanding gas behavior, designing experiments, and industrial applications like gas storage and transportation.

4. Using the Calculator

Tips: Enter amount in moles, temperature in Kelvin, and volume in liters. 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 intermolecular forces, perfectly following the gas laws.

Q2: When does the ideal gas law not apply?
A: At high pressures or low temperatures where real gases deviate from ideal behavior due to molecular volume and intermolecular forces.

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

Q4: What are common units for pressure?
A: Atmospheres (atm), Pascals (Pa), millimeters of mercury (mmHg), and pounds per square inch (psi).

Q5: Why is R = 0.0821 in this equation?
A: This value of R is used when pressure is in atm, volume in L, temperature in K, and amount in mol.