Pour the water into a clear plastic box, color mixing, the water level is approximately ¼ of the plastic box, then observe the water level in the water level plastic hose external comparison of plastic pipes.
Pour the mix into a clear plastic box. The water level is high, about ¼ of the box in a plastic box. After observing the water level in the water level outside the tube, plastic tube plastic.
Pour some water mixed color into a clear plastic box The water level in the box is tall. ¼ of plastic box Then observe the water level in the water level outside the transparent plastic pipe plastic pipe comparison.