MYP Physics Topic Density Revision Notes

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MYP Physics Topic Density Revision Notes | RevisionDojo

Density Describes How Much Mass Is Packed Into a Volume

When you compare two objects of the same size, one might feel much heavier than the other.
This is not only about how big the object is, but it is also about what it is made of.

Comparing Size and Mass

Objects can be compared by their size (volume) and mass, but this does not fully describe the material.
Two objects can:
1. have the same size but different masses,
2. have the same mass but different sizes.
These differences are caused by how tightly matter is packed inside the object.

Example

A steel ball and a polystyrene block can be the same size, but the steel ball has much greater mass.

What is Density?

Definition

Density

Density is the amount of mass per unit volume of a substance.

Density describes how much mass is contained in a given volume.
It explains why materials with the same size can have different masses.
1. High-density materials have particles packed closely together.
2. Low-density materials have particles spaced further apart or contain air gaps.

$$\text{density} = \frac{\text{mass}}{\text{volume}}$$

Note

Density depends on both mass and volume, not just one of them.

Common Mistake

Saying objects float because they are “light.”
Floating depends on density, not just mass.

Note

The Greek letter rho ($\rho$) is commonly used for density.

Units of Density

Standard SI unit of density: kilograms per cubic metre (kg m⁻³).
Other commonly used units: grams per cubic centimetre (g cm⁻³).
Volume units are cubic, not linear.

Measuring Mass

Mass is measured using a balance.
Common units are grams (g) and kilograms (kg).
Mass must be measured carefully before calculating density.

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MYP Physics Density Notes

Density Describes How Much Mass Is Packed Into a Volume

Comparing Size and Mass

What is Density?

Units of Density

Measuring Mass

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Density Describes How Much Mass Is Packed Into a Volume

Comparing Size and Mass

What is Density?

Units of Density

Measuring Mass

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Forces and energy8 subtopics

Heat, light and sound6 subtopics

Electromagnetism9 subtopics

Waves5 subtopics

Astrophysics3 subtopics

Atomic physics2 subtopics

MYP Physics Density Notes

Forces and energy8 subtopics

Heat, light and sound6 subtopics

Electromagnetism9 subtopics

Waves5 subtopics

Astrophysics3 subtopics

Atomic physics2 subtopics

Density Describes How Much Mass Is Packed Into a Volume

Comparing Size and Mass

What is Density?

Units of Density

Measuring Mass

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Density Describes How Much Mass Is Packed Into a Volume

Comparing Size and Mass

What is Density?

Units of Density

Measuring Mass

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account