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12 Piece PVC Density Cylindrical Bars Set with Wooden Storage Base Shape_Rectangular Simulates kinetic gas theory through Simulates kinetic gas theory through an electric motor vibrating a transparent tube of small steel balls this kit pairs a solar cell with a miniature fan motor and 22 showing students that density stays constant as mass and volume change together Wooden block housed PVC density kit of 12 bars at identical 0
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