Density is defined as the mass-to-volume ratio of a substance, calculated using the formula ρ = mass/volume and expressed in units such as kg/m³ and g/cm³. Understanding density is crucial across various fields, including engineering, food, nutrition, and climate studies, as it influences material behavior under changing conditions. Key comparisons demonstrate that substances like oil and wood have lower densities than water and metals, respectively, illustrating the importance of density in predicting buoyancy and material properties.

1. DENSITY
Prepared by:
Arya Jamal

2. What is Density?
■ Density is mass per volume ratio.
■ The equation to calculate density is 𝜌=
𝑀𝑎𝑠𝑠
𝑉𝑜𝑙𝑢𝑚𝑒
.
■ Density quantify how much matter is packed in a specific amount of space.
■ Mathematically, Density is calculated by dividing the mass of an object over
it’s volume.
■ Units of Density are: kg/m³, g/cm³, and lb/ft³.

3. It’s importance in various fields:
■ It helps us understand the behavior of materials under different conditions,
like temperature and pressure.
■ And this is essential in many fields to choose certain materials according to
their nature, such as engineering fields, food and nutrition, and medical
fields.
■ And understanding how materials react to certain weather conditions, helps us
understand climate changes.
■ When changes in temperature or pressure happens, it can affect ocean water,
in which if it gets warmer, it will expand and take more space.

4. Calculating Density:
■ To calculate density we have to know the mass and volume of that object,
then we will divide the mass of that object over its volume.
■ For example, if we have 65kg mass of an object and 10m, it’s density will be
6.5 kilogram per cubic meter.
■ And Finally, the measurement of density should be very accurate.

5. Examples of Density comparison:
■ Water vs Oil: As you know when you put Oil in Water, the Oil floats over the
Water, and the reason for that is because the Oil’s density is lower than the
Water, meaning it doesn’t have have as much matter packed into it’s space as
much as the Water.
■ Wood vs Metal: Metals like Iron is denser than Wood, and that is exactly why
Wood will float on top of water, while Metals sinks in Water.

6. Examples of Density comparison:
Same Mass

7. Examples of Density comparison:
Same Volume

8. Conclusion:
■ In conclusion, density is a fundamental concept that measures how much mass
is packed into a specific volume. It plays a vital role in understanding the
behavior of materials under different conditions and has wide-ranging
implications across numerous fields.