Teacher Notes



Teacher Notes
Publication No. 12892
Equal Mass KitStudent Laboratory KitMaterials Included In Kit
Aluminum cylinder, 15 grams, ½" in diameter
Brass cylinder, 15 grams, ½" in diameter Polyethylene cylinder, 15 grams, ½" in diameter PVC cylinder, 15 grams, ½" in diameter Nylon cylinder, 15 grams, ½" in diameter Additional Materials Required
(for each lab group)
Water, 25 to 50 mL Beaker (optional) Dissection needle, piece of wire or toothpick Graduated cylinder, plastic, 50 or 100mL Safety PrecautionsNormal laboratory safety rules and procedures should be followed. DisposalAll materials may be saved for future use. Teacher Tips
Correlation to Next Generation Science Standards (NGSS)^{†}Science & Engineering PracticesUsing mathematics and computational thinkingAnalyzing and interpreting data Disciplinary Core IdeasMSPS1.A: Structure and Properties of MatterHSPS1.A: Structure and Properties of Matter Crosscutting ConceptsPatternsScale, proportion, and quantity Structure and function Performance ExpectationsMSPS14: Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed. Sample Data{12892_Data_Table_2}
Answers to Questions
Recommended Products


Student Pages


Student PagesEqual Mass KitIntroductionWhat is the relationship between volume and density? Do objects of equal mass have the same density? Let’s experiment and find out. Concepts
BackgroundIn this activity, the volume and density of five different cylinders of the same mass and diameter will be determined by water displacement. Using Equation 1, the volume of each cylinder may be determined. {12892_Background_Equation_1}
{12892_Background_Figure_1}
If the mass and the volume of an object have been measured, then the density may be found using the following equation.
{12892_Background_Equation_2}
Density, which is defined as an object’s mass divided by its volume, is a characteristic property of a material. The density of a solid is commonly expressed as g/cm^{3}. Remember that 1 mL = 1 cm^{3}. Specific gravity is a similar term to density. Specific gravity is a comparison of the density of a substance to the density of a reference substance (water for liquids). Since the density of pure water is approximately 1.00 g/cm^{3} at 20 degrees Celsius, the specific gravity of a substance is equivalent to the density. Specific gravity, however, is unitless. Materials
Water, 25–50 mL
Aluminum cylinder, 15 g, ½" in diameter Brass cylinder, 15 g, ½" in diameter Dissection needle Graduated cylinder, plastic, 50 or 100mL Nylon cylinder, 15 g, ½" in diameter Polyethylene cylinder, 15 g, ½" in diameter PVC cylinder, 15 g, ½" in diameter Safety PrecautionsAlthough these materials are considered nonhazardous, please follow proper laboratory safety guidelines. Procedure
{12892_Procedure_Table_1} Student Worksheet PDF 