lesson
Updated 6 days ago · 2 views
You can kick a soccer ball, drink a cold glass of milk, and blow up a party balloon with your breath. Even though they seem completely different, all of these things are made of matter — which is simply anything that takes up space and has weight.
Scientists sort all matter into three main groups called states of matter: solids, liquids, and gases.
What makes a wooden toy block different from the water in a swimming pool? Let's look at how solids behave.
Solids: Fixed Shape and Fixed Size
A solid has a definite shape and a definite volume, which means its shape and size do not change on their own.
If you take an apple out of your backpack and place it in a wide bowl, the apple stays an apple — it does not melt or stretch to fit the bowl.
📊A clean interactive visual diagram showing a solid wooden block inside three different shaped containers: a flat plate, a tall round jar, and a triangle box. In all three containers, the solid wooden cube keeps its exact same cube shape and size. Clear labels: 'Solid: Fixed Shape & Fixed Volume', with a green checkmark next to 'Holds its own shape'. Color palette: soft gray background (#f8f9fa), wooden block (#d97706), containers (#e2e8f0), text (#1e2945). Responsive to 350px width.
What happens if you spill that cup of milk instead of leaving it in the glass? Let's find out how liquids move.
Liquids: Flowing and Changing Shape
A liquid has a fixed volume, but it does not have a fixed shape. It flows smoothly and takes the shape of whatever container you pour it into.
If you pour 200 milliliters of juice from a tall, skinny bottle into a flat dish, it spreads out wide — but you still have exactly 200 milliliters of juice.
📊A visual diagram showing 200 mL of blue liquid poured between containers: first in a tall graduated cylinder showing '200 mL', then being poured into a wide round beaker showing '200 mL', then into a flat tray. An arrow connects them showing the liquid reshaping to match each container's base, with a label: 'Liquid: Changes shape, but volume stays the same (200 mL)'. Colors: bright liquid blue (#0284c7), containers (#e2e8f0), text (#1e2945). Responsive layout.
You can see a block and feel juice, but what about the invisible stuff that fills a bicycle tire?