Presentation on theme: "Density Density describes how heavy an object is compared to its size."— Presentation transcript:
1 Density Density describes how heavy an object is compared to its size. Think of two cubes that are the same size. One is made of metal and the other is made of Styrofoam. Which will be heavier?All substances have different densities, therefore, you can identify a substance if you know its density
2 Mass Mass is the amount of substance in an object It is constant no matter where you go, even the moon.To find mass, we put the object on a balanceMass is always in grams
3 Volume - two options Volume is how much space an object takes up. To find the volume of LiquidsUse a graduated cylinder to find the volumeIt will be measured in mLTo find the volume of rectangular SolidsMeasure length, width, and height; then multiply.It will be measured in cm3
4 Measuring Solid Volume 10 cm9 cm8 cmWe can measure the volume of regular object using the formula length x width x height._____ X _____ X _____ = _____We can measure the volume of an irregular object using water displacement.Amount of H2O with object = ______ About of H2O without object = ______ Difference = Volume = ______
6 Density UnitsWhen we calculate density, the units we use are either g/mL or g/cm3. How do we know which set of units to use?g/ml - liquidsvolume of liquids are measured in millilitersg/cm3 for solidsVolume of solids are measured in cm3
7 Water What is the density of water? If an object is less dense than water it will float.If an object has a greater density than water it will sink.
8 To Calculate Density The formula to calculate something’s density is: D = densityM = massV = volumeMDV