Equation for Density

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We can say density of a substance is its mass per unit volume. We can show the density by a Greek letter ρ. We can say the density mathematically as ratio of mass and column. Therefore, we can write
 
Examples 1: A block of aluminum has a volume of 18 cubic meters and a mass of 54 kg. Find the density of block aluminum.

Solution: The given information is

Volume = 18 cubic meters

Mass = 54 kg

We know the formula to find the density that is


Now we can plug the values in this formula

Examples 2: Sulfuric Acid has volume of 65 cubic meters and mass of 78 kg. Find the density of sulfuric acid.

Solution: The given information is

Volume of sulfuric acid = 65 cubic meters

Mass of sulfuric acid = 78 kg

We know the formula to find the density that is 

Examples 3: If the density of gold is 20 grams per cubic centimeter. Find the mass of a bar of gold  that measure 6 cm x 4 cm x 2 cm.
Solution: The given information is

Density = 20 gm/cubic cm

Volume = 6 x 4 x2 = 48 cubic cm

We know the formula to find the mass that is

Mass = Density x volume = 20 x 48 = 960 gm.




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