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We are learning the lesson about gases/gaseous states at our school and I couldn't help but wonder, why learn about IDEAL GASES... How do ideal gases help us to analyze about real gases?
mjc123 said:Well, you could study lots of tables of experimental P,V,T data. But that's a lot of numbers, and wouldn't give you much understanding.
The ideal gas is a simple model that often (not always) gives a good approximation to the behaviour of real gases, in terms of a few basic physical principles, that hopefully gives the student an insight into the basic processes going on in gases, and how these affect their physical properties. When the behaviour of real gases is not ideal, it is often convenient to treat it as ideal with some small deviations due to factors not taken account of in the ideal model. Thus the van der Waals equation has terms to correct for the volume of the molecules and the intermolecular forces, both of which are relatively very small in near-ideal conditions. The vdW equation is itself a model, not an exact description of a real gas. The only such description is experimental data, but that in itself doesn't give understanding, as I said, or make it easy to predict the properties in different conditions. A model, such as the ideal gas or van der Waals gas, helps to do that. that is what makes it science as distinct from mere observation.
Studying ideal gases is important because they serve as a fundamental model for understanding the behavior of real gases. Ideal gases follow simple laws that can be used to predict and explain the properties of real gases, making it easier to understand and work with them in various scientific and industrial applications.
An ideal gas is a theoretical gas that follows certain assumptions, including having particles that have no volume, do not interact with each other, and have elastic collisions. It also follows the ideal gas law, which states that the pressure, volume, and temperature of an ideal gas are directly proportional to each other.
The study of ideal gases has many practical applications, such as in the design of engines and other machinery, the production and storage of gases, and the understanding of weather patterns. It also provides a basis for understanding the behavior of real gases, which are present in our everyday lives.
The ideal gas model is a simplified representation of real gases and does not account for all factors that may affect their behavior, such as intermolecular forces and the volume of gas particles. It also assumes that gases are at low pressure and high temperature, which may not always be the case.
The study of ideal gases is closely related to other branches of science, such as thermodynamics, chemistry, and meteorology. It provides a foundation for understanding the behavior of gases in these fields and is often used in calculations and experiments to make predictions and draw conclusions.