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Science Classes 912

Heavy for its size?

Mass alone does not tell you density.

About 12 minutes Read · try · explain
Take your time. Speak, draw or write your answers.
01 / UNDERSTAND

Here is what is happening.

Density is mass divided by volume. Units must be consistent: grams per cubic centimetre, for example. Two objects with equal mass can have different densities if their volumes differ. For a uniform object in a liquid, comparing their densities helps predict floating or sinking.

02 / MAKE IT YOUR OWN

Your little investigation

What you need

Paper and a calculator if you wish. Use the given imaginary measurements.

  1. Object A: mass 60 g, volume 20 cm³. Object B: mass 60 g, volume 30 cm³.

  2. Calculate each density and include units.

  3. Explain why the equal masses do not imply equal densities.

03 / CHECK YOUR UNDERSTANDING

What is A’s density?

Choose one answer
KEEP ASKING

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