Ontario Grade 9 Science Class Practice Exam

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What is density defined as?

The volume of an object divided by its mass.

The mass of an object divided by its volume.

Density is defined as the mass of an object divided by its volume. This relationship indicates how much matter is packed into a given space. The formula for density is expressed as:

\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \]

When you divide the mass (which is a measure of the amount of matter in the object) by the volume (which indicates the space the object occupies), you obtain a value that describes how concentrated that matter is. This concept is crucial in understanding various physical properties of materials, such as whether an object will float or sink in a fluid.

If the density of an object is greater than that of the fluid it is in, it will sink; if it is less, it will float. This principle applies broadly in science, including fields such as materials science, engineering, and environmental science. Understanding density helps to predict how substances interact with each other and their environments.

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The weight of an object in a given space.

The total mass of all components in a substance.

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