Site icon Crack BMAT

Density

Density of an object basically means how tightly the matter of the object is packed together. 
It can also be defined as mass per unit volume.

Density = Mass ÷ Volume
⍴ = m ÷ V

The unit of density is kg/m³ or g/cm³


Example:
A rock weighing 0.6 kg has a volume of 15 cm³. What is its density?

Solution:
Since the mass is given in kilograms, we need to convert it into grams.
Mass = 0.6 kg = 600 g
Volume = 15 cm³
⍴ = 600 ÷ 15 = 40 g/cm³


Example:
A cuboidal block of glass has dimensions 1m x 60 cm x 2 m. It weighs exactly 2 kg. What is its density?

Solution:
Dimensions of the block = 1 m x 0.6 m x 2 (convert 60 cm to 0.6 m)
Since the block is cuboidal, we can use the formula: (l x b x h) to find the volume. 

Volume = (1 x 0.6 x 2 )= (2 x 0.6) = 1.2 m³
Mass = 2 kg
⍴ = (2 ÷ 1.2) = 1.66666… = 1.67 kg/m³


Exit mobile version