SI unit of Density | What is the SI unit of Density
- Kilogram per meter cube
Hello dear students in this section we are going to discuss the essential quantity in physics i.e. density. Density gives us details about structure of matter present in any material. Density signifies the strength, molecular forces, mass and many more things when we study the properties of material.
It is convenient to classify the materials on the basis of density for e.g. substance with higher density is generally metals, whereas substances with lesser density are non metals etc.
Density can be defined as,
“Mass per unit volume of substance is called as Density.”
If M is mass of substance,
V is the volume of substance then,
∴ Density = (mass )/volume
∴ Density = M/V
It is mostly indicated by symbol ‘ρ’.
From the above equation, SI unit of density can be written as,
Density = M/V = kilogram/meter^3
SI unit of density is kg/m^3
Now if we want to convert the SI unit of density to its CGS form then,
We know that,
∴ 1 kilogram = 10^3 gram
And
∴ 1 meter = 10^2 centimeter
Important Faq on SI Unit of Density
Q.1) How one can compare state of substance with the help of density?
Answer: Molecules of substance are closely packed and crowded in substance having higher density. This allows the substance to have specific shape and size. i.e. on the basis of density one can distinguish the substance in to three states viz. solid, liquid and gas.
Q.2) How density signifies whether the substance is going to float or sink in water?
Answer: Substance like stone, metal ball is having more density than that of water hence it gets sinks in to the water. Whereas the substance like petrol, oil, wood etc are having less density than water hence it floats on water.
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