States Matter Design

Overview

In this 20-minute Technology lesson, students use the defining properties of solids, liquids, and gases to design and model a simple 3D “states of matter” display. The focus is on choosing shapes and features that match how each state behaves, then explaining the choices using evidence from observable properties and the particle model.

Learning intentions

• Students will identify key properties of solids, liquids, and gases by comparing shape, mass, and volume.
• Students will represent each state in a simple 3D design using modelling materials.
• Students will explain why their design features match the observable behaviours of the state of matter.
• Students will document design thinking clearly using short labels or sentences.

Success criteria

• I can state how each matter state differs in shape and whether it takes up a set volume.
• I can show one clear 3D design feature for solid, liquid, and gas on my display.
• I can use particle-model words (particles, close together/able to move) to justify my design choices.
• I can label my display so another person can understand what each part represents.

Curriculum links

• Physical Science — States of matter: Classifying materials into states using defining properties of shape, mass, and volume.
• Physical Science — Particle nature of matter: Using representations of the particle model to explain observable properties of solids, liquids, and gases.
• Physical Science — States of matter: Explaining changes in shape, mass, and volume during state changes using observable and measurable evidence.
• Technology (NZ Curriculum Refresh): Developing and using designed solutions by planning, making, and communicating to meet an identified need or goal.

Lesson structure (20 minutes)

1. 0–3 min · Launch (hook). Teacher holds up three quick examples (e.g., sand, water, air-in-a-bag) and asks: “Which has a fixed shape, which flows, and which is hard to see but can still take up space?” Students turn-and-talk, then share one observation for each state.

2. 3–8 min · Mini teach (properties + design link). Teacher displays a simple table: Solid (fixed shape, fixed volume), Liquid (no fixed shape, fixed volume), Gas (no fixed shape, no fixed volume). Teacher links to particle model: particles close together in solids, able to move in liquids, far apart in gases. Students complete a quick oral check: “What design feature would you use to show ‘fixed shape’ for a solid?” (one answer per table row).

3. 8–14 min · Design task (plan a 3D display). Teacher gives each group a template with three boxes labelled Solid / Liquid / Gas and prompts: “Sketch one 3D idea per box and add a 1–2 sentence label explaining the match to properties.” Students sketch and decide which materials to use (modelling clay/paper for solids, pourable/rollable parts for liquids, balloon/streamers/space markers for gases).

4. 14–18 min · Make (build the 3D solid–liquid–gas model). Teacher circulates, asking: “How does your model show shape and volume for this state?” and “Where are the ‘particles’ in your design?” Students build their 3D elements and add at least one label per state.

5. 18–20 min · Share + exit check. Teacher selects two groups to do a 30-second “design tour”: they point to each state and explain using shape/volume words. Students complete a 20-second written exit ticket: “One property that matches my solid design is… / One property that matches my gas design is…”

Resources

• Template page with three labelled sections: Solid / Liquid / Gas
• Cardboard base (one per group) for the 3D display
• Modelling materials: clay or plasticine, small beads/pasta pieces, paper/card, glue/tape
• “Gas” representation items: balloon, tissue paper, or ribbon/streamers (teacher-safe)
• Water cup or damp sponge for demonstrating liquid flow (optional)
• Marker pens for labels
• Timer and teacher slide/board with property table (shape, mass, volume)

Assessment

• Teacher observation during planning: students correctly connect design features to fixed/no fixed shape and fixed/no fixed volume.
• Teacher checks labels during making: students use at least one scientific property term (shape, mass, volume) and/or particle-model wording.
• Exit ticket: quick written evidence that each state’s design matches the correct observable properties.

Differentiation

• Support: Provide sentence starters for labels (e.g., “In a solid, the particles are close together, so it has ____.”). Offer a reduced materials-choice set.
• Support: For students needing help, give a “match-the-feature” card (e.g., solid = blocky shape; liquid = shape that changes when poured; gas = space markers).
• Extension: Challenge students to include one measurable or observable test they could do next (e.g., compare whether a volume stays the same when transferring between containers).
• EAL/SEN: Allow oral responses to be written as a diagram or single keyword label; use visual property icons (fixed shape icon, fixed volume icon, space-filled icon).