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
In general, density will increase as you change from a gas to liquid to solid Density and States of Matter
Factors affecting Density Temperature Pressure
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
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
How to calculate density? Mass Volume Mass = grams (how much matter is in an object) Density = Volume = 1. ) Regular shaped object = L x W x H (units = cm 3) 2. ) Irregularly shaped object = Use the water displacement method
Density is independent of size and shape! What does that mean? ? 2 g / 4 cm 3 = 0. 5 g/cm 3 Now cut that sample in half … what will happen to the density? ? 1 g / 2 cm 3 = 0. 5 g/cm 3 The density stays the same!!! UNLESS THE TEMP. OR PRESSURE CHANGES DENSITY REMAINS THE SAME!
How to manipulate the density formula to calculate Mass and Volume when density is known M D V