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Elementary idea of Relative Density Video Lecture - Class 9

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FAQs on Elementary idea of Relative Density Video Lecture - Class 9

1. What is relative density and how is it calculated?
Ans. Relative density, also known as specific gravity, is the ratio of the density of a substance to the density of a reference substance. It is calculated by dividing the density of the substance by the density of the reference substance.
2. What are some examples of substances with high relative density?
Ans. Some examples of substances with high relative density include lead, gold, mercury, and platinum. These substances are denser compared to other materials and have a higher mass per unit volume.
3. How does relative density affect the buoyancy of an object?
Ans. Relative density plays a crucial role in determining the buoyancy of an object. If the relative density of an object is greater than the density of the fluid it is placed in, it will sink. If the relative density is less than the density of the fluid, it will float. In other words, the relative density determines whether an object will sink or float in a fluid.
4. What is the importance of relative density in industries?
Ans. Relative density is important in industries for various reasons. It helps in quality control by providing information about the purity and composition of substances. It is also used in the determination of the concentration of solutions, such as in the pharmaceutical and chemical industries. Additionally, relative density is crucial in the design and construction of structures, as it helps in assessing the stability and strength of materials.
5. How does temperature affect the relative density of substances?
Ans. Temperature can have an impact on the relative density of substances. In general, as the temperature increases, the density of most substances decreases, leading to a decrease in their relative density. However, this is not true for all substances, as some materials may exhibit anomalous behavior with temperature changes. It is essential to consider the temperature when measuring or comparing relative densities.
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