High School Physics


Density & Relative density

Density is the mass per unit volume. The unit of density in SI is Kg/meter3. The relative density or specific gravity of a substance is the ratio of its own density and the density of water. It’s a number only without any unit. What is the difference between density and relative density? Density is the […]

What is the difference between mass and weight

Mass and Weight – are they the same or different? Mass and weight are different. Mass is the quantity of matter; it is an absolute measurement of how much matter is in a body or an object. The SI unit of mass is the kilogram (kg). Weight is the force that acts on a mass […]

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