Have one wooden block, one clear cup of water and one sealed clear bag of air ready to show. Hold each up in turn and take two or three quick answers. Do not name the three states yet; let curiosity lead.

What to listen for: children often say air is "nothing" or that sand (if they have met it) is a liquid because it pours. Note those ideas without correcting them yet.

Keep this beat light. The stations come out in the next activity, not here.

Project only the short board version above. Use the table below yourself when you need a fuller gloss or an example to point at. Keep the core trio to solid, liquid and gas; particle talk belongs in the interactive step later, not as a fourth equal board term here.

Misconception to head off: sand pours, so children often call it a liquid. Each grain is a solid. Sand pours because many tiny solid grains slide over one another. Save the full correction for the sand station, but plant the seed here if someone raises it.

Worked model (say aloud before stations): "I wonder if this block will keep its shape when I leave it alone. I predict it will, because it feels firm. I put it down… I observed it still looks the same. I think that means it is a solid." Model one full cycle on the block only; children then run the same questions at every station.

Before the lesson

Use shared rotating stations, not a full kit on every table. Plan groups of about four to six children so each station stays calm for pouring.

How many station sets:

• Up to about 20 pupils (roughly three or four groups): one set of four stations is enough.
• A typical 24–28 class (five or six groups): run two identical sets of four so no more than three groups share each physical station area and pour queues stay short. Do not wait until 28+ to double up; the middle of the class-size range is where water and sand get crowded.
• Larger than 28: still two sets; keep groups to six or fewer and shorten talk time slightly if needed.

Label each station with a simple number card only.

• Station 1 — blocks: one tray with several wooden or building blocks.
• Station 2 — water: one jug of water and two clear cups so children can pour from one to the other.
• Station 3 — sand: dry sand in one shallow tray with one small cup for pouring.
• Station 4 — air bag: two or three clear sealable bags, each puffed with air and sealed.

If you run two sets, double those station quantities (two trays of blocks, two water set-ups, two sand trays, two air-bag stations).

Plan about three minutes of hands-on talk per station plus a short move. Stay near the water and sand stations for spill control. Groups talk only at stations; they do not write yet.

Teaching tips

At the sand station, ask: Is every tiny grain keeping its own shape, or is the whole pile one liquid? Draw out that each grain is a solid, even though the pile pours.

At the air bag, ask children to gently squeeze (not pop) and notice the bag still feels full. Air is a real material, not "nothing".

Differentiation: less confident groups work with an adult or older peer and answer the three questions aloud only. Confident groups can try pouring water into a differently shaped container and say what stayed the same.

Stand at the IWB or board and capture a quick class table with four rows (block, water, sand, air bag) and three columns (holds shape? / pours? / fills whole container?). Children call out; you tick or write short phrases.

Sand row on the board: leave space for a longer phrase, not a single tick. Write something like pile pours / each grain solid so the class can see that a longer answer is the right capture. Do not force a bare yes/no in "holds shape". The pile only loosely keeps a shape; each grain keeps its own shape. Pours yes as a pile. Does not fill a container the way a gas does. Name sand as many tiny solids that slide.

Expected pattern:

• Block: holds shape yes; pours no; fills whole container no (it keeps its own shape).
• Water: holds shape no; pours yes; fills the bottom of its container and takes that shape.
• Sand: pile pours / each grain solid (as above).
• Air bag: holds shape no; does not pour like water; fills the whole bag yes.

Misconception: if the class votes sand as a liquid, praise the pour observation, then hold up one grain (or pinch a few) and ask whether that single grain keeps its shape.

Fold the whole class in with cold-call questions: Do you agree with that group? What would you change?

Open the states-of-matter interactive in guided mode on the IWB. Substance is water. Step through the guided beats below; do not let children drive the slider yet until the last prompt.

Supporting idea (particles): particles are the tiny pieces a material is made of. They are far too small to see, but the way they pack and move explains why solids, liquids and gases behave differently. Keep this as the explanation layer after children have met the three behaviours, not as a fourth equal board word from the start. The pupil board already carries the plain gloss; revoice it once if anyone looks unsure.

What appears on screen: particles of water in a container. As temperature changes, they move from a fixed wobbling pattern (solid ice) to sliding and pooling low (liquid water) to racing through the whole container (gas / water vapour). The state name and a one-line reading follow after the watching.

Guided path (match the on-screen steps):

• Start cold (solid): particles packed in a pattern, only wobbling. Ask: Why does ice keep its shape?
• Warm past melting point (liquid): particles slide past each other and sit low in the container. Ask: What changed — the particles themselves, or the way they move?
• Warm past boiling point (gas): particles race and fill the whole container. Link back to the air bag: a gas spreads to fill its space. True water vapour is invisible; do not treat a white kettle cloud as the gas.

Key teaching line: the material is still water in all three states. Heating and cooling change how the particles move, not what they are.

If the interactive is unavailable, sketch three simple boxes on the board (dots fixed / dots sliding low / dots everywhere) and narrate the same three beats.