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THE PHYSICAL EDITION

Puffs and Splashes

Vince wonders what is inside a bottle that looks empty. A puff on his hand leads him to bubbles, water flowing in, and a surprising difference when the lid goes back on. A story about air, water and following a clue.

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Explore the science

Air takes spacePages 1–2

Vince holds up an empty-looking capped bottle, then gently dents its flexible sides. The bottle contains air. With the lid closed, a gentle squeeze puts that air into a smaller space; the bottle wall also resists bending.

Ask together: What might be inside even when we cannot see it?

An open way outPages 3–4

A grown-up removes the cap. Vince squeezes the bottle toward his open palm. With the mouth open, the squeeze can push some air out. Its effect can be felt even though the air itself is invisible.

Ask together: What changes when the lid comes off?

Air bubbles under waterPages 5–6

Vince lowers the open bottle mouth under water and squeezes. Bubbles leave the mouth and rise through the basin. Water gives the escaping air visible boundaries. These are air bubbles in plain water, not soap bubbles.

Ask together: Where do the first bubbles appear?

Water enters as the bottle recoversPages 7–8

Vince relaxes his hands with the bottle mouth still submerged. The sides recover and water appears inside. A resilient bottle expanding after a squeeze lowers its internal pressure. Water can enter through the submerged opening; the amount depends on the bottle and squeeze.

Ask together: What is different inside after Vince lets go?

Water resists compressionPages 9–10

A grown-up fills the same bottle to the brim. With its cap on, Vince finds it much harder to squeeze. With the bottle full and closed, its volume changes very little under a gentle squeeze because water compresses far less than air.

Ask together: How does this compare with the first squeeze?

Water can flow outPages 11–12

The cap comes off again. Vince gently squeezes the bottle over the basin and a short splash leaves its mouth. Opening the mouth gives the water a route out. A squeeze can drive outflow, and tipping an open bottle can also pour.

Ask together: What has the open lid changed?

Air returnsPages 13–14

Vince drains the remaining water, then holds the empty-looking bottle and feels another puff against his palm. Air enters as the bottle recovers outside the water. The bottle can look empty while still holding air.

Ask together: Does the bottle seem the same to Vince now?

Sources and evidence

  1. A bottle without liquid still contains air, which occupies space.

    Science World: What's in a Bottle?

    Air is invisible; the story depicts observable effects rather than air particles.

  2. Air in a tightly capped flexible bottle can be compressed into less space; a gentle squeeze changes its shape but meets resistance.

    ACS Inquiry in Action, Grade 5 Lesson 1.1: Matter is Made of Tiny Particles

    Use a flexible bottle that recovers after a gentle squeeze. Some resistance comes from its wall; a crushed disposable bottle may not recover.

  3. Squeezing an open flexible bottle pushes some of its contents out through its mouth; escaping air can be felt, and escaping water is visible.

    UBC PHAS: Punctured Bottle, Pressure Grade 4

    Science World: What's in a Bottle?

    The opening provides an outlet. Tipping can also pour water; a stream alone does not measure the contribution of the squeeze.

  4. Squeezing an uncapped resilient bottle with its mouth under water expels air as bubbles; releasing the squeeze while the mouth remains submerged allows water into the recovering bottle.

    Dorothy Alfke, Squeeze Bottle Science (The Science Teacher, October 1954), reprinted NSTA 1963

    ACS Inquiry in Action, Grade 5 Lesson 1.1

    JSME Fluids Engineering Division: Water Fountain 3 (Using Negative Pressure)

    Keep the opening submerged and downward while the sides recover. Orientation and bottle stiffness affect the result; no particular bubble count, refill fraction or timing is implied.

  5. The same capped flexible bottle filled to the brim with water is much harder to squeeze than when it contained air.

    ACS Inquiry in Action, Grade 5 Lesson 1.1

    The comparison uses the same bottle filled to the brim with its lid closed and a gentle squeeze. Trapped air and wall stiffness affect how it feels.

  6. As the drained, uncapped resilient bottle recovers its shape in air, surrounding air enters again; it can give another puff.

    Science World: What's in a Bottle?

    UBC PHAS: Punctured Bottle, Pressure Grade 4

    A drained bottle can retain droplets while air enters the space left by the water.

Water and Wind

Water and Wind, pages 1–2: Wind moves the pinwheel.

Spread 1 / 12

Wind tickles my cheek. Round goes my pinwheel.

Explore the science

Wind & forcesPages 1–2

Wind moves the pinwheel. Wind is moving air. Vince feels it on his cheek and sees it push the pinwheel's angled blades.

Ask together: What tells you that the air is moving?

Currents & eddiesPages 3–4

Water passes the rock. A leaf circles behind it. Most water passes the rock; some circles back in an eddy. Laminar flow is orderly; turbulence is irregular, mixing motion. A swirl alone cannot distinguish them.

Ask together: How does the leaf move compared with the water passing the rock?

Waves & energyPages 5–6

Waves spread from the stream. The duck bobs. The falling stream makes waves that carry energy outward and make the toys bob. The stream's current also carries toys along. Bobbing and drifting are different motions.

Ask together: What moves up and down? What moves along the pond?

BuoyancyPages 7–8

A duck floats. A pebble sinks. Water pushes upward on both objects. This buoyancy balances the duck's weight, but not the pebble's. The pebble's splash makes the rings on the next spread.

Ask together: Where is each object compared with the surface?

When waves meetPages 9–10

Two wave patterns approach one another. When gentle waves overlap, their heights add, briefly raising or lowering the surface. This interference does not erase the waves; they continue through one another.

Ask together: What might happen where the two patterns meet?

Surface tensionPages 11–12

Tiny dents appear beneath the strider’s legs. Surface tension helps support the strider where its water-repellent legs dent the water. The duck floats mainly by displacing water.

Ask together: What do you notice where its legs meet the water?

Suction & pressurePages 13–14

The duck bubbles, fills and squirts. Squeeze underwater: air bubbles out. Release with the opening submerged: the elastic duck springs back, lowering pressure inside. The surrounding water pressure pushes water in. Squeeze above water: water exits through that same opening.

Ask together: What changes when Vince squeezes and then lets go?

Lift & gravityPages 15–16

A paper plane glides forward and down. The throw starts the plane moving. Airflow around its wings produces lift and turns air downward. Gravity pulls down; drag resists motion. In still air, the plane glides forward and gradually descends.

Ask together: Where might the plane go next?

ViscosityPages 17–18

Milk runs. Honey stretches into a thread. Honey's greater viscosity means greater resistance to flow. It makes a slow thread while milk runs readily. Temperature and pouring method also matter; this snack is an observation, not a controlled test.

Ask together: How do the milk and honey move differently?

Draining & swirlingPages 19–20

Foam curves inward toward the drain. Gravity drives water through the drain. Existing turning motion can become a curved inward flow, traced by foam. Here water travels to the outlet, unlike waves crossing the pond. Not every drain swirls.

Ask together: Can you follow the foam toward the drain?

Scientific observationPages 21–22

Vince sketches what he noticed. Vince records something he noticed. Drawings, marks or words let him return to an observation. He does not need all the answers.

Ask together: Which earlier picture matches one of his drawings?

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