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Science · Grades 3–4

Density

noun

The amount of mass in a given volume of a substance.

Example Sentences

"Oil floats on water because oil has a lower density."

"Iron has a much higher density than wood."

Synonyms & Related Terms

mass per volume

Quick Check

Which best describes the meaning of density?

Study Tips

To remember density, try writing it in a sentence of your own. Connect it to something you already know about science.

Use it in conversation today — saying a word aloud three times helps lock it into long-term memory.