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DENSITY. Density = amount of matter per unit volume. D = m/v (g/cm 3 ) Mass usually expressed in grams Volume usually expressed in cm 3 or ml etc. M ÷ ÷ D X V. Mass =. Density =. Volume =. M V. M D. The “DMV” Triangle for Volume, Mass, and Density. D x V.

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density
DENSITY
  • Density = amount of matter per unit volume

D = m/v (g/cm3)

  • Mass usually expressed in grams
  • Volume usually expressed in cm3 or ml etc.
the dmv triangle for volume mass and density

M

÷ ÷

DXV

Mass=

Density =

Volume=

M

V

M

D

The “DMV” Triangle forVolume, Mass, and Density

DxV

what would take up more space a kilogram of feathers or a kilogram of steel
What would take up more space??? A kilogram of feathers…..or a kilogram of steel??

OR

density is the measure of the compactness of a material
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
gases
Gases
  • How much kinetic energy do the molecules have??
  • The greater the kinetic energy
  • ……the greater the volume
  • …… and the less dense that gas is!!
  • Therefore, cold air is more dense than warm air
slide7

Low pressure weather system means warmer air tends to rise,

High pressure systems indicate a colder more dense air mass that will……. SINK!!!

liquids
LIQUIDS
  • The more dissolved solids in a solution, the more dense (such as ocean water)
  • Cold water in lakes tend to sink (this creates a constant mixing of water, nutrients, and other substances)
        • Kinetic energy again!!

Denser layers to less dense layers…..

what would happen
What would happen????
  • Mercury density = 13600kg/m3
  • Lead density = 11340kg/m3
solids
Solids

Ice vs. water…..

solids1
SOLIDS
  • Ice is less dense than water (which is why lakes and ponds have a thin layer of ice covering in winter, with water underneath)
  • Various rocks, woods, metals have a characteristic density specific to that substance

Wouldn’t you like to have a bunch of THIS dense material?

factors affecting density
Factors affecting Density
  • Temperature
  • Pressure
factors affecting density1
Factors affecting Density
  • Dissolved solids – in liquids
      • Concentration and kind of substances
determining density
DETERMINING DENSITY
  • Regular Shapes – mass, then determine the volume by formula

EX: cubes, cylinders, spheres, cones, etc.

  • Irregular shapes – mass, then measure displacement of a liquid (usually water) by that irregularly shaped object

Use a graduated cylinder

Add water to a predetermined level - record.

Gently drop in the irregularly shaped object.

Read the graduated cylinder – record.

Subtract the first water level from the second – this is the volume

density table
Density Table

SINK or FLOAT

In Water (D = 1.0 g/mL)

Float

Float

Float

Sink

Sink

Sink

Float

(alcohol)

Float

(fuel)