The Ideal Gas Law is a cornerstone equation in thermodynamics and physical chemistry that describes the behavior of a hypothetical ideal gas under varying conditions. By linking pressure, volume, temperature, and the number of moles, scientists and engineers can predict how gases will react during compression, heating, or chemical reactions.
Ideal Gas Equation
P × V = n × R × T
Where P is Pressure, V is Volume, n is moles, R is the universal gas constant (8.314 J/(mol·K)), and T is absolute Temperature in Kelvin.
How to Use This Calculator
- Select the gas variable you wish to calculate (Pressure, Volume, Moles, or Temperature).
- Input the known variables (ensure temperature is converted to Kelvin).
- Select the correct unit for pressure (e.g., atm, Pascals, mmHg) to automatically adjust the gas constant.
- Click Calculate to evaluate the gas state.
Frequently Asked Questions (FAQ)
What makes a gas "ideal"?
An ideal gas is a theoretical model where gas molecules have no volume and do not exert intermolecular attractive or repulsive forces on each other. While no real gas is perfectly ideal, most behave ideally at high temperatures and low pressures.
Why must temperature be in Kelvin?
The Kelvin scale is an absolute temperature scale starting at absolute zero (where all molecular motion stops). Using Celsius or Fahrenheit would introduce negative numbers and zero into the multiplication, breaking the proportional relationships defined by the law.