density how compact is the material?. how close the atoms or molecules are to each other more...
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DensityHow compact is the material?
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How close the atoms or molecules are to each other
More than“heaviness”- density includes how much space an object takes up!
All substances have density including liquids, solids, and gases
Density is the measure of the “compactness” of a material
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“Compactness”
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DensityDensity describes how much mass
is in a given volume of a material.
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Mass is the amount of matter in an object (usually measured in grams)
Volume is the amount of space an object takes up (usually measured in ml or cm3)
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Density Equation
D = mv
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Given:mass = 1500 g; volume = 1700 mL
Equation: D = m/v
= .88 g/mL
Solve: 1,500 g ÷ 1,700 mL = 0.8823529 g/mL
A solid wax candle has a volume of 1,700 mL. The candle has a mass of 1.5 kg (1,500 g). What is the density of the candle?
Word problems
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What do you think?
If the volume stays the same and the mass increases . . . the density will
If the mass stays the same and the volume increases . . . The density will
increase
decrease
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The units used for density depend on whether the substance is solid or liquid.
◦For liquids use units of grams per milliliter (g/mL)
◦For solids use density in units of g/cm3 or kg/m3.
Units for density
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Density of common materials
Liquids tend to be less dense than solids of the same material. ◦Ex. solder
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• Water is an exception to this rule.
• The density of solid
water (ice) is less than the density of liquid water.
Density of common materials