Here is a little fun activity to do with the Kids. You will need: 1 clear Glass . 10 Raisins . Carbonated Water 1: Pour the Carbonated Water into the Glass 2: Add the Raisins 3: See what happens.... The Raisins begin rising up to the top of the glass and then sink back to the bottom. Up they go again and down they go again. Why? The tiny bubbles of Carbon Dioxide stick to the Raisins at the bottom of the glass and carry them up to the top. Once enough bubbles pop the Raisins sink to the bottom again and then begin collecting more bubbles to rise to the top.