Each group needs:

• two-pan balance with gram weights
• large bowl, ~2–3 inches deep
• non-drying modeling clay, one 1-inch diameter ball per student
• 5-10 paper towels sheets
• water in a pourable cup
• 1 slender glass cup or other clear container; best of the container is of uniform size if possible, that is, almost a perfect cylinder; also choose a container that can be marked on; refer to procedure steps 12-15
• 1 sharpie pen or china marker
• small handful of at least three of the following materials to use as boat loads: small metal nuts (1/4-inch works well), paperclips, fish weights (without lead), dry beans, marbles; for best results, use objects that are denser than water
• Student Guide Worksheet