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Phases of Water

Heat or cool a container of water and observe the phase changes that take place. Use a magnifying glass to observe water molecules as a solid, liquid, or gas. Compare the volumes of the three phases of water.

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Phases of Water screenshot

Learning Objectives

  • Understand that, in normal conditions, water can exist in three different states.
  • Compare solids, liquids, and gases in terms of having a fixed shape or volume.
  • Describe the phase changes that occur when heat is added to or removed from water.
  • Compare the structure, spacing, and motion of molecules in solids, liquids, and gases.
  • Compare the volume and density of each phase. (Extension)
  • Notice that water is denser as a liquid than a solid. (Extension)

Vocabulary

boil, condense, density, freeze, gas, liquid, melt, molecule, phase, solid, volume

Lesson Materials

Student Exploration Sheet

MS Word PDF Google Doc

Exploration Sheet Answer Key

Subscribers Only

Assessment Questions

Subscribers Only

Teacher Guide

Instructors Only

Vocabulary Sheet

MS Word PDF

 Spanish/French version included with a subscription.

Screenshot of Cell Energy Cycle Gizmo

Cell Energy Cycle

Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified photosynthesis and respiration formulae can be balanced.

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Screenshot of Flower Pollination Gizmo

Flower Pollination

Observe the steps of pollination and fertilization in flowering plants. Help with many parts of the process by dragging pollen grains to the stigma, dragging sperm to the ovules, and removing petals as the fruit begins to grow. Quiz yourself when you are done by dragging vocabulary words to the correct plant structure.

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Screenshot of Growing Plants Gizmo

Growing Plants

Investigate the growth of three common garden plants: tomatoes, beans, and turnips. You can change the amount of light each plant gets, the amount of water added each day, and the type of soil the seed is planted in. Observe the effect of each variable on plant height, plant mass, leaf color and leaf size. Determine what conditions produce the tallest and healthiest plants. Height and mass data are displayed on tables and graphs.

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Screenshot of Plants and Snails Gizmo

Plants and Snails

Study the production and use of gases by plants and animals. Measure the oxygen and carbon dioxide levels in a test tube containing snails and elodea (a type of plant) in both light and dark conditions. Learn about the interdependence of plants and animals.

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© 2025 ExploreLearning. All rights reserved. Gizmo and Gizmos are registered trademarks of ExploreLearning. STEM Cases, Handbooks and the associated Realtime Reporting System are protected by US Patent No. 10,410,534

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