Day 7 of 30
Density introduction
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Learning Objective
Students will be able to explore density.
In this lesson, we'll explore density introduction. Scientific inquiry allows us to investigate and explain natural phenomena.
Density is the amount of mass packed into a given volume: Density = Mass ÷ Volume (D = m/V), measured in g/cm³ or g/mL. Dense objects have a lot of matter packed tightly together; less dense objects have more space between particles. Why objects float or sink: an object floats if its density is less than the fluid's density; it sinks if its density is greater. Water has a density of 1.0 g/mL—objects with D < 1.0 float, D > 1.0 sink. Ice (0.917 g/cm³) floats on water—crucial for aquatic life in winter. Mass is measured using a balance; volume is measured using a graduated cylinder (for liquids or irregular solids via water displacement). Density is a physical property that helps identify substances and explain layering phenomena.
As you work through today's material, pay attention to the examples and try to identify the patterns or strategies being used. This will help you apply these concepts to new problems.
Take notes on key points and make connections to what you've already learned in previous lessons.
To examine systematically through observation and experiment
Observable facts that support or refute a claim
Instructions
Materials Needed
- Lab notebook
- Investigation materials
- Safety equipment if needed
Teaching Tip
For this age group: Balance direct instruction with collaborative activities. Allow students to explain their thinking and make connections to prior knowledge when exploring density introduction.