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A drop of ink falls into a bucket of water. Soon the whole bucket looks blue.

Nobody stirred it. How did one drop reach every corner?

One drop, spread through a whole bucket.

This is Chapter 7, Particulate Nature of Matter. One picture of tiny pieces explains it.

What you will learn

Pieces too small to see — what a substance is made of.
Gaps between them — where dissolved sugar goes.
They never stop moving — why a colour or a smell spreads.
Three arrangements — solid, liquid and gas.
Warming them up — melting point and boiling point.
Squeezing — why air squeezes and water does not.
Using the picture — answer real questions with it.

Need a quick recap?

Solid, liquid, or gas? (Track Zero) — most things take one form.
Same water, three forms (A Journey through States of Water) — one substance.
Dissolving is not disappearing (same track) — sugar breaks into tiny pieces.
Melting and boiling (Changes Around Us) — heat changes a thing's state.

Stay safe

Nothing here is real. Every glass and bowl is on the screen. Do not taste anything you meet in a lab.