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Quantitative measurements

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These are measurements that use numbers to show amounts or sizes. For example, measuring your height in inches or the temperature in degrees.

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Physical quantities

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These are things we can measure in the world, like weight, length, temperature, or time.

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Property changes

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This happens when something about a material changes, like its shape, color, or state (solid, liquid, or gas), but it's still the same substance.

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Matter

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Everything around you that takes up space and has weight is made of matter. It can be a solid, liquid, or gas.

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Solid

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A type of matter that keeps its shape and doesn't flow. Think of things like rocks, books, or ice.

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Liquid

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A type of matter that flows and takes the shape of its container. Water, juice, and milk are examples of liquids.

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Gas

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A type of matter that spreads out to fill whatever space it's in. Air and the steam from boiling water are examples of gas.

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Conservation of matter

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This means that matter can’t be created or destroyed. Even when it changes form, like when ice melts into water, the amount of matter stays the same.