Ideal Gas and other State Calculators Hands-On Tutorial

Smart Thermodynamic State Calculator: Ideal Gas
|TEST Home Page> Utility Applets> Ideal Gas

|Intro |Instructions| |Ex.1| |Ex.2|
Welcome to the Smart Thermodynamic Table: Ideal Gas page, part of the 'Utility Applets' library of TEST, The Expert System for Thermodynamics. TEST is a network of HTML pages with embedded Java Applets that helps users solve thermodynamic problems and perform parametric studies visually without any programming.

An Ideal gas can be simply defined as a gas (or liquid) that obeys the ideal gas equation p=rho.R.T. All gases under low pressure (compared to the critical pressure) and/or high temperature (about 250K or more) can usually be treated as ideal gases. Gases covered by the Ideal Gas Calculator include: Air, Nitrogen(N2), Oxygen(O2), Hidrogen (H2), Carbon-di-Oxide(CO2), Carbon-monoxide (CO), Argon(Ar), Neon(Ne), Helium(He), Methane(CH4), Ethane(C2H6), Ethylene (C2H4), Propane(C3H8), Butane (C4H10) and Steam(H2O).

The Smart Thermodynamic Table is more than a visual thermodynamic state calculator for Ideal gases. In this ideal gas table a state is visually presented (see the examples below) as a collection of variables (such as p, T, v, h, s etc.). A gas is chosen from a selection of gases and known variables are entered in any order and in any units (the applet checks for redundancy of inputs, converts units internally, provides balloon help and generates suitable warnings when appropriate) and a click on the 'Calculate' button evaluates the states partially or fully if sufficient information is known. The calculated states are auto-saved and can be plotted on a 'p-V', 'T-s' or other thermodynamic diagrams by choosing a plot-type from the diagram selector.

While evaluating a state related to another (say, isentropic states), algebraic expressions involving state variables can be used. For instance, to evaluate State-2, isentropic to State-1, one can enter s2 as '=s1'. Once a series of states are evaluated, updating all calculations for a change in any input variable is a snap. Simply change the value and click on the 'Super-Calculate' button. The smart table takes care of the rest making it an exciting visual design tool for the 'What-If' people. A more comprehensive introduction can be found in the Introduction/Tutorial page (linked at top) and is highly recommended for all users.

The examples below contain images of the ideal gas table in action. Once you get a rough idea about how the smart table works, you can start using the real thing by following these instructions.

|Intro |Instructions| |Ex.1| |Ex.2|
There are two ways of doing anything, the quick way and the right way.

If you are in a hurry, do the following: (a) Browse the examples below (takes only a minute), and (b) Launch the customized Java applet (called a daemon) by clicking the appropriate link at the top of this page. If you have a modern browser (Netscape 4.5 or better, Microsoft IE 4.0 or better), the daemon will appear in about 10-50 seconds (1 second if you are running from a locally installed TEST) and you can start exploring.

To fully exploit TEST follow thest steps: (a) Start the Introduction/Turorial for the Expert System by clicking the link at the top of this page. (b) Explore a few daemons as explained in the tutorial. (c) Browse a few topics of your choice from the Slide Show. (d) Once you understand the algorithm TEST applies for locating the right daemon for a given problem, you can use the TEST-Map to quickly launch a desired daemon. Of course, all these may take better part of an hour - but, trust me, you will not regret it.

|Intro |Instructions| |Ex.1| |Ex.2|
|Intro |Instructions| |Ex.1| |Ex.2|
|Intro |Instructions| |Ex.1| |Ex.2|