Lesson Overview

Students will:

• Participate in droplet observation activities
• Carry out investigations of three properties of liquids: cohesion, surface tension, and adhesion
• Direct the instructor to model the interactions of water molecules represented by pipe cleaners
• Observe Traveling Water Demonstration (video with scientist-led discussion)

Lesson Outcomes

Students will be able to:

• Carry out investigations to observe the effects of cohesion, adhesion, and surface tension
• Use their understanding of these properties to explain phenomena observed both in the lesson and in their life experience

This lesson is aligned with these Next Generation Science (NGS) Standards.

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Disciplinary Core Idea (DCI)

PS1 Matter and its Interactions – PS1.A Structure of Matter

• (3rd-5th) Because matter exists as particles that are too small to see, matter is always conserved even if it seems to disappear. Measurements of a variety of observable properties can be used to identify particular materials.

Science & Engineering Practice (SEP) 

Planning and Carrying Out Investigations

• (3rd-5th) Make observations and/or measurements to produce data to serve as the basis for evidence for an explanation of a phenomenon or test a design solution.

Crosscutting Concept (CCC)

Structure and Function

• (3rd-5th) Different materials have different substructures, which can sometimes be observed.

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