Lei gases ideais
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
P = nRT/V
About this calculator
The Ideal Gas Law calculator helps determine parameters like pressure, volume, temperature, or substance quantity of a gas using the formula PV = nRT. It's useful for students, engineers, or chemistry professionals solving ideal gas problems. Enter three known values, and the calculator will compute the fourth automatically.
The rearranged formula P = nRT/V is used when calculating pressure. Here, P is pressure in atm, V is volume in liters, n is the number of moles, R is the gas constant (0.0821 L·atm/mol·K), and T is temperature in Kelvin. All values must use consistent units for accurate results.
This tool is ideal for analyzing closed systems, such as chemical reactions or gas storage. However, keep in mind that the ideal gas law is an approximation. Real gases deviate under extreme conditions (high pressure or low temperature). Always verify units and convert temperature to Kelvin before using this calculator.
Frequently asked questions
What is the Ideal Gas Law?
It's an equation (PV = nRT) relating pressure, volume, temperature, and moles of an ideal gas. It assumes gas particles don't interact and occupy no volume.
Which units should I use in the calculator?
Pressure in atm, volume in liters, quantity in moles, temperature in Kelvin. The gas constant R is fixed at 0.0821 L·atm/mol·K.
My result is incorrect. What should I do?
Check if all units are correct and temperature is in Kelvin. Ensure the equation was applied for the parameter you're solving for.
Why convert temperature to Kelvin?
Because the Kelvin scale is absolute and avoids negative values, ensuring thermodynamic calculation accuracy.