Because D=m/v, water must also have density. Do you think a liquid, like water can have a density? Students should realize that water has volume and mass. The bucket containing more water has more mass.Īsk students: In lessons 3.1-What is Density? and 3.2-The Water Displacement Method, you found the density of solids, by measuring their mass and volume. Ask the student volunteer which bucket appears to have more mass.Select a student to lift both buckets of water.Half-fill one bucket and add only about 1 cup of water to the other. Engage Do a demonstration to introduce the idea that water has density.Two identical buckets or large containers.Balance that measures in grams (able to measure over 100 g).Make sure you and your students wear properly fitting goggles. The activity sheet will serve as the “Evaluate” component of each 5-E lesson plan. Evaluationĭownload the student activity sheet, and distribute one per student when specified in the activity. Students will be able to explain that since any volume of water always has the same density, at a given temperature, that density is a characteristic property of water. Students will be able to measure the volume and mass of water and calculate its density. Students make a graph of the relationship between the volume and the mass of water. Then they measure the mass of different volumes of water and discover that the density is always the same.
Students measure the volume and mass of water to determine its density. The density of a substance is the same regardless of the size of the sample.The density of water is 1 gram per cubic centimeter.Just like a solid, the density of a liquid equals the mass of the liquid divided by its volume D = m/v.The mass and size of the molecules in a liquid and how closely they are packed together determine the density of the liquid.The molecules of different liquids have different size and mass.The volume of a liquid can be measured directly with a graduated cylinder.Just like solids, liquids also have their own characteristic density.
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