Leonard is describing a tequila sunrise to Penny as “a wonderful example of how liquids with different specific gravities interact in a cylindrical container.”
This is the physics explanation of how the different colored liquids, each of which has a different density. But of course I’m thinking how pretty it looks. I still had some cotton candy vodka leftover from the 4th so I searched the internet for some recipes and I found Cotton Candy-tini. I had Dole pineapple juice, some maraschino cherries and a martini glass and VOILA my experiment for scientific purposes ONLY was created!! It tasted so good that it only took a few more days to finish the bottle of cotton candy! Off to Costco to get another bottle!