Density

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Density Noun

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[den-si-tee]

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Density

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A measure of the amount of matter in a given volume, indicating how tightly packed a substance's particles are.

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Example: This diagram shows that objects and liquids arrange themselves based on density. The less dense cork and oil float above the denser water and padlock.

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Mass Noun

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[mas]

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Mass

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The measure of the amount of matter contained within a physical body, independent of its size or volume.

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Example: This image uses a balance scale to show that the apple has more mass (more 'stuff') than the 1g weight, causing the scale to tip.

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Volume Noun

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[vol-yoom]

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Volume

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The amount of three-dimensional space that a substance or object occupies or contains, measured in cubic units.

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Example: This image shows that the volume of a cube, the amount of 3D space it occupies, is calculated by multiplying its side length (s) three times.

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Matter Noun

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[mat-er]

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Matter

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Any substance that has mass and takes up space by having volume, composing all physical objects in the universe.

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Example: This diagram shows how particles in matter are arranged in solid, liquid, and gas states, which helps explain why solids are typically densest.

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Rho (ρ) Noun

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[roh]

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Rho (ρ)

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The Greek letter symbol commonly used in scientific equations and formulas to represent the density of a substance.

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Example: Density (ρ) is the amount of mass (m) packed into a certain volume (V). The smaller box is denser because its particles are packed more tightly together.

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Kilograms per cubic meter (kg/m³) Noun

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[kil-o-grams per kyoo-bik mee-ter]

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Kilograms per cubic meter (kg/m³)

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The standard international (SI) unit of measurement for density, representing mass in kilograms per one cubic meter of volume.

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Example: This diagram shows a cube with sides of 1 meter (a volume of one cubic meter) having a mass of 1 kilogram, visually defining density.

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Grams per milliliter (g/mL) Noun

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[grams per mil-i-lee-ter]

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Grams per milliliter (g/mL)

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A common metric unit for density, especially for liquids, which is equivalent to grams per cubic centimeter (g/cm³).

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Example: This image shows a table of different units used to measure density, but it does not visually explain the concept of grams per milliliter.

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Kinetic Energy Noun

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[ki-net-ik en-er-jee]

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Kinetic Energy

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The energy an object possesses due to its motion, which increases with temperature and causes particles to spread apart.

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Example: This image shows the conversion of stored potential energy in a drawn bow to kinetic energy, the energy of motion, as the arrow is released and flies.

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Concentration Noun

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[kon-sen-tray-shun]

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Concentration

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The measure of a dissolved substance within a particular volume of another substance, which directly affects overall density.

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Example: This diagram shows that concentration is the amount of a substance (blue dots) in a given space. As the number of dots increases in the same size box, the concentration goes from low to high.

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Displacement Noun

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[dis-pleys-muhnt]

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Displacement

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The action of an object pushing aside a volume of fluid that is equal to its own volume when submerged.

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Example: Submerging an object in a liquid causes the liquid level to rise; the volume of this displaced liquid is equal to the volume of the object.