| 
                Water tank 
                        
                            | Material: | Acrylic board walls 1mm thick pyrex glass base and cover
 |  
                            | Height: | 6cm |  
                            | Depth: | 20cm |  
                            | Width: | 20cm |  The tank was built like a set of nested
                    boxes, so by changing the middle box, the
                    depth of the working fluid can also be
                    changed.3)
                    Working fluid Water  Visualization Liquid
                    crystal capsules were used to make the
                    temperature visible.  Experimental process After placing the water tank on the rotating
                    table, by putting cold water in the
                    section above the working fluid to be
                    observed, and warm water below it, a
                    temperature gap is caused, which results in
                    convection.  |   |