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## JSS2: BASIC SCIENCE - 1ST TERM

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#### Quizzes

Lesson 2, Topic 8
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# Density Determination

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#### Topic Content:

• Density Determination Using Direct Method
• Density Determination for Irregular Solids
• Relative Density and its Determination

### Density Determination Using Direct Method (Regular Solids):

Density is defined as mass per unit volume. The unity of density in metric units is kg/m3.

The symbol for density is the Greek letter rho, $$\scriptsize (\rho)$$

Mathematically, it is given as:

Density = $$\frac{mass\:(m)}{volume \:(v)}$$

⇒ $$\scriptsize \rho = \normalsize \frac{mass \:(m)}{volume \:(v)}$$

Mass (m) = $$\scriptsize density \: (\rho) \: \times \: volume \: (v)$$

⇒ m = $$\scriptsize \rho \: \times \: v$$

and;

Volume (v) = $$\frac{mass\: (m)}{density \: (\rho)}$$

⇒ v = $$\frac{m}{\rho}$$

If the mass is expressed in gm and the volume in cm3, then the unit of density is gm/cm3. The mass of a regular object is determined by using a suitable weighing balance and the dimensions of the regular object are measured to determine its volume.

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