Density

Density is a material that is specified as mass per unit volume, or weight per unit volume. Now.. why is density important? Well, density is applied to many chemicals that are being tested. It can find out the buoyancy of an object or fluid. To calculate density, there is a formula...and here it is..

 

Density = mass/volume                       

           OR  

Volume = mass/density 

           OR  

Mass = Density x Volume

*Once you memorize one of them, you can move them around as you would mathematically to calculate density, volume or mass.

now... make sure you REMEMBER THE FORMULAS OF DENSITY!!!

To represent density:

solids - g/cmᵌ

liquid - g/mL 

If there is 1cmᵌ of water = 1 mL

then the density of water = 1.0g/mL

                                      = 1000g/L

Ex. Calculate the density of a liquid which has a volume of 28mL and a mass of 26.4g

density = mass ÷ volume

density = 26.4 ÷ 28 = 0.94 g/mL

Unless the fluids are mixed together, fluids that are less dense float on fluids that are more dense.

The Cup of fluids on the left have different density`s and as you see, the fluid on the top ( the clear fluid) is the least dense, the fluid on the bottom (the pink fluid) is the most dense, the fluid in the middle (the blue fluid) has density that is between the clear and pink fluid. The cup of fluid on the right can be mixed together with other fluid.

 

ᵈobjects > ᵈliquid = sink

ᵈobjects < ᵈliquid =float

For more practice, go to this site: http://serc.carleton.edu/mathyouneed/densitysp.html

watch this video for more help: