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| Density |
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| 0.5 kg of cotton occupies more space than 0.5 kg of iron. The particles of iron are closely packed while that of cotton are loosely packed. The amount of iron packed in a unit volume is more. This explains as to why iron is heavier than the same volume of cotton. |
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| In Physics, we describe the lightness or heaviness of different substances by using the word density. |
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| The density of a substance is defined as the mass of the substance per unit volume. |
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| Where, 'D' represents the density, 'M' mass and 'V' volume. |
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| SI unit of density is kg/m3. |
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| The density of a substance remains the same under certain specified conditions. Thus the density of a substance is one of its characteristic properties and this property can be used to determine the purity of any substance. |
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