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Ideal Gas vs. Real Gas: What's the Difference?

Edited by Huma Saeed || By Sawaira Riaz || Published on January 5, 2024
An ideal gas is a theoretical gas that perfectly follows the gas laws under all conditions, while a real gas exhibits deviations from these laws under high pressure or low temperature.

Key Differences

An ideal gas is a hypothetical concept in which gas molecules do not interact with each other and the volume of gas particles is negligible compared to the volume it occupies. In contrast, real gases have intermolecular forces and the volume of the particles is significant, especially under high pressure or low temperature.
Sawaira Riaz
Jan 05, 2024
Ideal gases perfectly obey the Ideal Gas Law (PV=nRT), where P is pressure, V is volume, n is the amount of substance, R is the gas constant, and T is temperature. Real gases, however, deviate from the Ideal Gas Law under extreme conditions due to particle interactions and size.
Sawaira Riaz
Jan 05, 2024
In ideal gases, collisions between particles are perfectly elastic, meaning there is no loss of kinetic energy during collisions. Real gases have inelastic collisions under certain conditions, with energy loss due to intermolecular forces.
Sawaira Riaz
Jan 05, 2024
The behavior of ideal gases is often used as a model in physics and chemistry because it simplifies calculations and understanding of gas behavior. Real gases more accurately represent the behavior of gases in practical, real-world conditions, although they are more complex to model.
Huma Saeed
Jan 05, 2024
At standard temperature and pressure (STP), real gases often behave similarly to ideal gases, but as conditions deviate from STP, differences in behavior become more pronounced.
Sawaira Riaz
Jan 05, 2024
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Comparison Chart

Intermolecular Forces

No intermolecular forces
Intermolecular forces present
Sawaira Riaz
Jan 05, 2024

Compliance with Gas Laws

Always follows Ideal Gas Law
Deviates from Ideal Gas Law under extreme conditions
Huma Saeed
Jan 05, 2024

Particle Volume

Negligible particle volume
Particle volume is significant under high pressure
Sawaira Riaz
Jan 05, 2024

Collision Nature

Elastic collisions
Inelastic collisions possible under certain conditions
Aimie Carlson
Jan 05, 2024

Behavior under STP

Behaves according to theory
Behaves similarly to ideal gas but with slight deviations
Janet White
Jan 05, 2024
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Ideal Gas and Real Gas Definitions

Ideal Gas

Collisions between ideal gas particles are perfectly elastic.
In an ideal gas, the total kinetic energy is conserved during particle collisions.
Sawaira Riaz
Dec 23, 2023

Real Gas

A real gas is a gas that exhibits deviations from ideal behavior, especially under high pressure or low temperature.
At high pressures, the behavior of real gases significantly deviates from that predicted by the Ideal Gas Law.
Sawaira Riaz
Dec 23, 2023

Ideal Gas

It perfectly follows the Ideal Gas Law under all conditions.
Ideal gas behavior is a useful approximation in many chemical reactions.
Sawaira Riaz
Dec 23, 2023

Real Gas

It has intermolecular forces and particle volume that affect its properties.
The liquefaction of real gases is due to the presence of intermolecular attractions.
Huma Saeed
Dec 23, 2023

Ideal Gas

Ideal gases are used as models to simplify gas behavior in physics.
The behavior of an ideal gas is foundational in understanding real gas properties.
Harlon Moss
Dec 23, 2023

Real Gas

Real gases are actual gases as they exist in nature.
The study of real gases helps in understanding atmospheric phenomena.
Sawaira Riaz
Dec 23, 2023

Ideal Gas

Ideal gas particles are considered point particles with no volume.
The concept of an ideal gas simplifies the study of gases in thermodynamics.
Sawaira Riaz
Dec 23, 2023

Real Gas

Real gases do not perfectly follow the Ideal Gas Law.
Real gases like oxygen and nitrogen exhibit ideal behavior only at certain temperatures and pressures.
Sawaira Riaz
Dec 23, 2023

Ideal Gas

An ideal gas is a hypothetical gas with no intermolecular forces and negligible volume.
In ideal gas theory, gases expand infinitely when heated at constant pressure.
Sawaira Riaz
Dec 23, 2023

Real Gas

Their behavior becomes more ideal-like at high temperature and low pressure.
At low pressures, the volume of a real gas approaches that predicted for an ideal gas.
Harlon Moss
Dec 23, 2023

FAQs

What is the Ideal Gas Law?

The Ideal Gas Law is PV = nRT, relating pressure, volume, number of moles, and temperature.
Sawaira Riaz
Jan 05, 2024

Does an ideal gas exist?

No, it's an idealization for simplicity in physics and chemistry calculations.
Huma Saeed
Jan 05, 2024

Why study ideal gases?

They provide a simplified model to understand gas behavior.
Sawaira Riaz
Jan 05, 2024

Can real gases be compressed?

Yes, unlike ideal gases, they can be compressed.
Aimie Carlson
Jan 05, 2024

Can real gases behave like ideal gases?

Yes, many real gases approximate ideal gas behavior under certain conditions.
Harlon Moss
Jan 05, 2024

Is air an ideal gas?

Air can be approximated as an ideal gas under normal conditions.
Harlon Moss
Jan 05, 2024

Are ideal gas calculations accurate?

They are accurate under conditions of low pressure and high temperature.
Sawaira Riaz
Jan 05, 2024

Why do real gases deviate from ideal behavior?

Due to intermolecular forces and the volume occupied by gas molecules.
Aimie Carlson
Jan 05, 2024

What is an ideal gas?

An ideal gas is a theoretical gas whose molecules do not interact and occupy no volume.
Sawaira Riaz
Jan 05, 2024

What assumptions are made for ideal gases?

No intermolecular forces and molecules occupy no volume.
Sawaira Riaz
Jan 05, 2024

Are real gas effects significant in everyday life?

Usually not under normal conditions, but in industrial processes, they can be important.
Harlon Moss
Jan 05, 2024

How does temperature affect ideal gases?

Their volume and pressure increase with temperature.
Harlon Moss
Jan 05, 2024

What are the limitations of the ideal gas model?

It fails at very high pressure and low temperature.
Sawaira Riaz
Jan 05, 2024

How does pressure affect real gases?

High pressure can significantly change their volume and behavior.
Aimie Carlson
Jan 05, 2024

How do real gases behave at very low temperatures?

They can liquefy or solidify, deviating significantly from ideal gas behavior.
Janet White
Jan 05, 2024

What is a real gas?

A real gas is an actual gas that has volume and intermolecular forces.
Sawaira Riaz
Jan 05, 2024

How do real gases differ from ideal gases?

Real gases deviate from the Ideal Gas Law, especially at high pressure and low temperature.
Aimie Carlson
Jan 05, 2024

Are all gases real gases?

Yes, all gases that actually exist are real gases.
Aimie Carlson
Jan 05, 2024

Do real gases always follow the Ideal Gas Law?

No, they often deviate from it under certain conditions.
Janet White
Jan 05, 2024

What is the van der Waals equation?

It's a modified Ideal Gas Law that accounts for volume and intermolecular forces in real gases.
Harlon Moss
Jan 05, 2024
About Author
Written by
Sawaira Riaz
Sawaira is a dedicated content editor at difference.wiki, where she meticulously refines articles to ensure clarity and accuracy. With a keen eye for detail, she upholds the site's commitment to delivering insightful and precise content.
Edited by
Huma Saeed
Huma is a renowned researcher acclaimed for her innovative work in Difference Wiki. Her dedication has led to key breakthroughs, establishing her prominence in academia. Her contributions continually inspire and guide her field.

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