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DENSITY. D = m/v (g/cm 3 ) Mass usually expressed in grams Volume usually expressed in cm 3 or liters, etc. Density. Density = amount of matter per unit volume Density is the ratio of mass to volume If the volume stays the same and the mass increases . . . the density will increase

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density
DENSITY

D = m/v (g/cm3)

  • Mass usually expressed in grams
  • Volume usually expressed in cm3 or liters, etc.
density1
Density
  • Density = amount of matter per unit volume
  • Density is the ratio of mass to volume
    • If the volume stays the same and the mass increases . . . the density will increase
    • If the mass stays the same and the volume increases . . . The density will decrease
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
slide7

Measurements in the Lab:

Example B

Example A

1. If the glassware is marked every 10 mLs, the volume you record should be in mLs. (Example A)

2. If the glassware is marked every 1 mL, the volume you record should be in tenths of mLs.

3. If the glassware is marked every 0.1 mL, the volume you record should be in hundredths of mLs. (Example B)

0 mL

30 mL

20 mL

1 mL

10 mL

30-mL beaker:

the volume you write in your lab report should be 13 mL

2 mL

Buret marked in 0.1 mL: you record volume as 0.67 mL

slide8

Low pressure weather system means warmer air tends to rise,

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

balloon and liquid nitrogen
Balloon and liquid nitrogen
  • http://paer.rutgers.edu/pt3/movies/TVrhoandFb.mov
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
relative density
Relative Density
  • The density of a material or substance, relative to another substance
  • Expressed in a ratio: water = 1g/cc
  • Water is the substance to which we generally compare other substances
slide19

How are Submarines like fish….

  • The swim bladder in bony fish control their relative density in order to rise or dive in the water….buoyancy
  • When air is added to the swim bladder, by diffusion through the blood vessels in the bladder walls, the fish becomes less dense overall
  • when air is removed fish become more dense
  • By changing the volume of air in the bladder, the fish’s density can be made equal to that of the surrounding water at a given depth.
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)