When turned upside down, this colorful viscous liquid takes about ten minutes to slowly flow through a large opening in the sealed plastic container. Much can be observed: liquid flowing downward, bubbles (air) flowing upward, liquid sticking to the top and dropping as streamers, etc. Good viscosity demo for your science table.CAN YOUR STUDENTS EXPLAIN THIS? Cover the outside of a soother and start it rolling down an incline. It takes several minutes! Why?