1. prepare a solution of known type 2 solution density ratio of the substance carbon tetrachloride (CCl4). 2. Insert the 5 types of fibers, preparing it to observe the float. 3. wait approx. 2 minutes the float observations 4. the hole in the bottom of the glass, plastic, rope can pass fit. 5. remove the nylon rope into the hole hundreds of both glass and knotted inside the glass, large enough to prevent a rope can break. 6. preparation of the equipment according to the old way, but change the type of a straw rope, polyester yarn from natural fibers, silk, respectively. 7. take the glass that is over a hundred different kinds of rope with one side of the glass as the source of the sound by tapping fork sound. 8. the other side will have a Sound level Meter is a meter App intensity of sound. 9. follow the verse 7 and 8, but change the type of rope: nylon poly fiber, straw, natural fiber and yarn.
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