Density DynamicsDensity= mass per unit volume

Density (g/mL or g/cm3) = Mass (g) ÷ Volume (mL or cm3)

What is the Density of Water?Mass of Graduated Cylinder & Water = ______ gMass of empty Graduated Cylinder = -______ g

Mass of Water only = _______ g Volume of Water = ÷ _______ ml

Density of Water = _______ g/ml

DENSITY OF WATER ~ = 1!If an object has a density greater than > 1, then it will SINK!

If an object has a density less than < 1, then it will FLOAT!

MV

“DMV”

Word Definition Equipment Unit(s) Pic/Symbol

Weight

Amount of gravitational force on an

object(can change)

ScalePounds

Or Newtons

Mass

Amount of MATTER in an

object(does not change)

Balance Grams

Volume

Amount of SPACE an

object takes up

RulerOr GC

cm3 OrMl

Density

Mass per unit Volume

D = M/V

Calculator

g/cm3 Or

g/mlD MV

D of Water = 1!D > 1 = SINK!D< 1 = Float!

Density Drawings!Density Drawings!

If you are ever asked to draw an object in water according to its’ density, here’s how:

1. Remember these helpful hints…• The Density of Water is = to ___.• Anything that ______ has a Density less than < 1.• Anything that Sinks has a Density _________ than > 1.2. Calculate the Density of the object by using the formula Density = ______ ÷

___________3. To figure out where the object will settle in water follow these simple rules…• If the Density of the object is greater than > 1, then the object sinks in the water

– down to the ___________!• If the Density of the object is equal to 1, then the object floats in the __________ of

the water.• If the Density of the object is less < than 1, then convert the density into a _____.

The percentage that you calculate is how much of the object is ___________ in the water. The remaining percentage to equal a total of 100% is the amount of the object that is __________ out of the water.

• For example, the density of a certain object = ___• To express it as a percentage would be 80%, so 80% of the object would be

__________ the water line while ____ would be above it! Here is a picture of it…

1

floatssinks

mass

volume

bottom

%

below 20%

submergedshowing

.8

middle

Water Line 20%

80%

Part I: Drawing DensityA. D= 3 g/ml B. D= .5 g/ml C. D= 1 g/ml

 D. D= .2 g/ml E. D= .7 g/ml F. D= .9 g/ml

Water

Line

Part I: Drawing DensityA. D= 3 g/ml B. D= .5 g/ml C. D= 1 g/ml

 D. D= .2 g/ml E. D= .7 g/ml F. D= .9 g/ml

Water

Line

A

B

C

DE F

Part II: Identifying Density

Water

Line

1 23 4

5

6

A. D= .25 g/ml # ___ B. D= .9 g/ml # ___

C. D= 1 g/ml # ___ D. D= .5 g/ml # ___

E. D= .1 g/ml # ___ F. D= 7g/ml # ___

326

1

54

Part III: Does Density Change?Wood Sample #1 Wood Sample #2 Wood Sample #3

Mass = 10 g Mass = 50 g Mass = 100 g

Volume = 5 ml Volume = 25 ml Volume = 50 ml

Density = ___ g/ml Density =___ g/ml Density =___ g/ml

1. What is the density of this wood type?

2. Was the density for each the same?

3. Why or why not?

4. Does the density for a particular substance change?

5. Does shape or size matter when it comes to the density of an object?

 

6. What happens if you break or cut a piece of that substance?

 7. Do the same principles of density

apply for all substances? Ex: Iron, copper, water,

aluminum, brass, etc. 8-10. What unit do we use to

measure mass? volume? density? 

2 2 2

Part

Does all wood float in water?

• Ironwood is a name applied to many species of hardwood trees, the wood of which is so dense and heavy that it sinks in water. North American ironwoods include the American hornbeam, the mesquite, the desert ironwood, and leadwood (Krugiodendron ferreum).

• Water has a specific gravity, or relative density, of 1. To sink in water, a substance must have a specific gravity greater than 1. Leadwood has a specific gravity between 1.34 and 1.42, making it the densest wood in the United States.

• The world's most dense wood is black ironwood (Olea laurifolia), also called South African ironwood. Found in the West Indies, it has a specific gravity of 1.49 and weighs up to 93 pounds (42.18 kilograms) per foot. The lightest wood is Aeschynomene hispida, found in Cuba, with a specific gravity of 0.044 and a weight of 2.5 pounds (1.13 kilograms) per foot.

Density of Dead Sea Water = 1.24 Kilograms

per Liter!

• In addition to its being the lowest place on earth, 423 meters (1388 feet) below sea level, there are many other interesting facts and figures about the Dead Sea region, which has been important to mankind from ancient times until the modern day.

• The Dead Sea is the second saltiest body of water in the world after Lake Assal in Djibouti, Africa.

• The salt concentration in the Dead Sea is 33.7%, compared with the salt concentration in the Mediterranean Sea, which is between 3.5% and 3.9%.

• The high salt content is what makes possible the unique floating experience enjoyed by bathers in the Dead Sea.