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Density!!!

Density!!!. What is density????. Density: The measurement of how tightly packed matter is within an object Or … how compact an object is. All substances have density including liquids, solids, and gases. Density is the measure of the “compactness” of a material.

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Density!!!

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  1. Density!!!

  2. What is density???? • Density: The measurement of how tightly packed matter is within an object • Or … • how compact an object is

  3. All substances have density including liquids, solids, and gases Density is the measure of the “compactness” of a material

  4. Density and States of Matter • In general, density will increase as you change from a gas to liquid to solid

  5. Factors affecting Density • Temperature • Pressure

  6. Factors effecting density …. • 1.) TEMPERATURE • When an object is heated, it will usually expands (increases in volume) • But… the mass will remain the same • So….. The density of a heated object will DECREASE

  7. Factors Effecting Density • 2.) PRESSURE • In general, as pressure is increased on solids and gasses, the volume will decrease • So….. Density will INCREASE as pressure increases • Liquid is not included because it will not compress

  8. How to calculate density? • Density = Mass Volume • Mass = grams (how much matter is in an object) • Volume = • 1.) Regular shaped object = L x W x H (units = cm3) • 2.) Irregularly shaped object = Use the water displacement method

  9. Density is independent of size and shape! What does that mean?? 2g / 4cm3 = 0.5 g/cm3 Now cut that sample in half … what will happen to the density?? 1g / 2 cm3 = 0.5 g/cm3 The density stays the same!!! UNLESS THE TEMP. OR PRESSURE CHANGES DENSITY REMAINS THE SAME!

  10. How to manipulate the density formula to calculate Mass and Volume when density is known M D V

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