Partial Pressure Calculator
Calculate partial pressure using Dalton's law, ideal gas law, and Henry's law
Calculate Partial Pressure
Total pressure of the gas mixture
Fraction of component gas (0-1)
Partial Pressure Results
Formula: P_i = P_total × X_i
Method: Dalton's Law of Partial Pressures
Analysis: Significant gas components
Applications: Industrial gas mixtures, breathing gases
Applicability: Ideal gas mixtures at any pressure
Limitations: Assumes ideal gas behavior
Example Calculations
Atmospheric Oxygen
Oxygen in air at sea level
Expected result: 21.3 kPa
Breathing Gas (Nitrox)
32% oxygen at 2 atm diving depth
Expected result: 64.8 kPa
CO₂ in Water
Carbon dioxide dissolved in water
Expected result: 0.29 kPa
Standard Conditions Gas
1 mole of gas at STP
Expected result: 101.3 kPa
Pressure Units Guide
Standard Atmosphere
1 atm = 101.325 kPa
Sea level air pressure
Pascal & Kilopascal
1 kPa = 1000 Pa
SI pressure unit
mmHg (Torr)
1 atm = 760 mmHg
Medical measurements
PSI
1 atm = 14.7 PSI
Engineering applications
When to Use Each Method
Common Gas Properties
Understanding Partial Pressure
What is Partial Pressure?
Partial pressure is the pressure that would be exerted by one component of a gas mixture if it occupied the entire volume alone at the same temperature. It's a fundamental concept in understanding gas behavior and chemical equilibria.
Key Concepts
- •Dalton's Law: Total pressure equals sum of partial pressures
- •Mole Fraction: Ratio of component moles to total moles
- •Ideal Gas Behavior: Assumes no intermolecular interactions
Calculation Methods
Dalton's Law
P_i = P_total × X_i
Best for known gas mixtures
Ideal Gas Law
P_i = (n_i × R × T) / V
For individual gas components
Henry's Law
P = K_H × c (or X)
For gas-liquid equilibrium
Real-World Applications
Breathing and Diving
Understanding oxygen and nitrogen partial pressures is crucial for safe diving and medical applications.
Environmental Science
Monitoring atmospheric gases and understanding pollution effects on air composition.
Industrial Processes
Optimizing chemical reactions, gas separation, and process control in manufacturing.