Uploaded October 2016 | Updated September 2026, 2 weeks ago
In this video we will derive two forms of the combined first and second laws of thermodynamics (energy and enthalpy forms).
We will start with a statement of the first law, then move to a statement of the second law. then define the reversible heat addition and reversible work done on the system, and finally solve for the combined law (energy form). Then we will use the definition of enthalpy to derive the combined law in terms of enthalpy.
In this video we will derive two forms of the combined first and second laws of thermodynamics (energy and enthalpy forms).
We will start with a statement of the first law, then move to a statement of the second law. then define the reversible heat addition and reversible work done on the system, and finally solve for the combined law (energy form). Then we will use the definition of enthalpy to derive the combined law in terms of enthalpy.
![Explained: Popup Menu GUI [MATLAB]](https://i.ytimg.com/vi/Wv6aSJ6ifaQ/mqdefault.jpg "Explained: Popup Menu GUI [MATLAB]
Pop-up menus can be used to make a selection from a list of items. This video shows how to get the users input from a pop-up menu in a MATLAB GUI.
Tip:
The method described in the video gives you a little bit more information to work with when extracting data from the popup menu, but if you want the most efficient code, you can use the code below.
popVal = get(hObject,Value);
assignin(base,popVal,popVal);
In this code, youre simply getting the selected value. The first choice is 1, the second choice is 2, and so on. You can then immediately assign this variable back into the base workspace. This code is much simpler, but you also wont have a variable with the strings of all the choices available. In most of my applications, I dont care about the actual strings, just about the value thats selected.")
![Explained: Check Box GUI [MATLAB]](https://i.ytimg.com/vi/XUdhhLyJHBg/mqdefault.jpg "Explained: Check Box GUI [MATLAB]
A check box can be used for selection or deselection of an option. This video describes how to get the status of a check box in a MATLAB GUI.
Download the code from my website:
http://goo.gl/jSWqAH")
