**Apparent density** (pb) is the ratio between the **apparent** volume and dry specimen mass of a soil sample. The volume is limited by external specimen forces which include voids. Therefore, it is measured in kilograms per cubic meter (kg/m3).

What is the significance of specific gravity of aggregate?

The coarse **aggregate specific gravity** test (Figure 1) is used to calculate the **specific gravity** of a coarse **aggregate** sample by determining the ratio of the **weight** of a given volume of **aggregate** to the **weight** of an equal volume of water. It is similar in nature to the fine **aggregate specific gravity** test.

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