## Ideal Gas Properties

Thermodynamic tables are derived by considering all gases or vapors as ideal gas. An equation of state is derived by considering the kinetic theory of gases. Many equations of state are available depending on a particular range of temperature, pressure, and volume. The characteristic gas equations are categorized as theoretical, generalized, or empirical.

Theoretical and generalized relations are based on ideal gas concepts, where pressure, volume, and temperature are correlated through the function of form:

`f(P,v,T) = 0`

This is called the equation of state, which describes the P-v-T behavior of substances. An equation of state provides a convenient method to relate the P-v-T data of a substance.

For ideal gas, the equation of state is Pv = RT.

Empirical relations are based on actual experiments conducted by scientists and depend on the substance. These relations hold true under the different conditions under which the experiments are performed.

Air consists of N 2, H 2, and O 2, which are permanent gases. Yet, air is considered a pure ideal gas, holding true for the equation state Pv = RT.

### Ideal Gas Properties: Air

The Ideal Gas Properties of Air table lists the ideal gas properties, such as specific enthalpy, specific internal energy, and specific entropy of air, at any given temperature varying from 100 k to 1,800 k.

to download an Excel sheet that provides the values of ideal gas properties of air at a given temperature.

Ideal Gas Properties of Air

T

##### Products & Services
Volumetric Gas Flow Switches
Volumetric gas flow switches are devices with a switch output used for measuring the flow or quantity of a moving gas in terms of a unit of volume per unit time, such as cubic feet per minute.
Vacuum Pumps and Vacuum Generators
Vacuum pumps and vacuum generators provide sub-atmospheric pressure for a variety of industrial and scientific applications where a vacuum is required.
Industrial Gases
Industrial gases are pure elements, molecular compounds or mixtures that are gaseous or vaporous at room temperature and pressure.
Cyclone Separators
Cyclone separators and centrifugal separators utilize centrifugal, gravitational, and inertial forces to remove fine particles suspended in air or gas.
High Vacuum Pumps
High and ultrahigh vacuum pumps operate efficiently in the high vacuum region and develop molecular flow for highly evacuated systems.

##### Topics of Interest

In this chapter, the thermodynamic characteristics of basic engine cycles are explained. For each concept, the thermal efficiency is derived from thermodynamic equations. 2.1 Introduction to...

4-1 SCOPE Methods are presented in this chapter for estimating the volumetric behavior of pure gases and liquids as a function of temperature and pressure. Section 4-2 introduces the framework of PVT...

7.1 INTRODUCTION Almost all materials expand when heated, regardless of the phase of matter. This thermal expansion can be related directly to the forces between the molecules. Different thermal...

It is a common approach in physics to try to simplify representation of material properties as much as possible. It is called modeling. For example, an ideal fluid means a fluid with vanishing...

Overview Nomenclature: p air pressure ? air density v air speed ? specific heat ratio T s static air temperature (free stream) T t total air temperature (at zero air velocity) R ideal gas constant a...

Product Announcements
Eastern Instruments
Hoffer Flow Controls, Inc.
Flow Technology, Inc.