updated link

posts/science/Microsoft Excel add-in for Chemistry related calculations.md

@@ -11,4 +11,8 @@ tags: ['science']
 Are you tired of having to type in property values after looking them up in a reference table/ chart/graph just to solve an engineering or science numerical problem ?
 This add-in will make your life a bit easier in case you are having to perform calculations using Microsoft Excel.
 
+Watch the below video for an overview of this add-in
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/SFXkGLy0Hhw?si=G3zEU3pw2nPqGrsS" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
+
 [Download the add-in](https://web.engr.uky.edu/~silverdl/apex.html)