Chapter 4 - Density and Buoyancy
Mass & Volume
 Before you can understand density you need to know about mass and volume.  Let's Review:
Mass
Mass is the amount of matter in an object.

Mass is always measured on a balance.  The triple beam
balance show here is the type we will be using in several
lab settings.
 The electronic balance will be used also.
 Mass in measured in grams or Kilograms!
Volume - Solids
 Simply put, Volume is the space that matter takes up.  There are two easy ways to measure the volume of a solid.
 O.K.  I know that math is not considered easy by some of you, but if you use a calculator and the proper formula it's a pretty simple way to get the answer.In this class we will only be using one formula, the formula for finding the volume of a rectangular solid.Volume = Length x Width x HeightBecause you are multiplying cm x cm x cm the label for your numbers will be in cubic centimeters or cm
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 Way #2 - DisplacementWe have already see that we can measure the volume of a liquid using a graduated cylinder.  We can also measure the volume of a solid that way Displacement means to push out of the way.  We see displacement when we get into a bathtub.  The water level rises by the volume of the 'us' that we put in the water
 If we put a solid object into a liquid, the solid will displace it's volume of beginning from the ending amount of liquid we have the volume of the solid.
Volume - Liquids
 Nothing could be easier than measuring the volume of a liquid.  You pour it into a graduated cylinder and your done!!There is one small catch though, the liquid may look like it is 'curving', if you notice this you just look for the bottom of the curve (called the meniscus)