Density --- By Tina Zhao

Density:
-The mass density or density of a material is defined as its mass per unit volume. The symbol most often used for density is ρ

Formula: 
-Mathematically, density is defined as mass divided by volume,Volume us defined as Mass divided by Density,and Mass is defined as Density multiply Volume:

   V=M/ ρ , M= ρ v

Ex1. An iron bar has a mass of 1200g with a volime of 1.25L,what is its density?

         we can use formula:  ρ=1200g/1.25=9.60g/l

Ex2. Neon is contained in a glass bulb having a volume of 22.4L. If the density of the neon is 0.900g/L, what is the mass of neon in the bulb?
     we can use formula: M=density x Volume, 0.900x 22.4=20.2g

Ex3. What is the volume of a tank that can hold 18 754 Kg of methanol whose density is 0.788g/cm³?
      if they have different Units, we should change Units first, and then calculate!!
    1.0.788g/cm³  became 0.000788kg/cm^{3
     2. we use: V=Mass/Density, 18754/0.000788=2380000000}cm<sup>3

 If you want to try more Density problem,the website is http://www.sciencebugz.com/chemistry/chprbdens.htm</sup> 

             Density of water = 1.0g/mL
             Dobject > Dliquid =sink
             Dobject < Dliquid =float