DENSITY- NOTES ON DENSITY

I Density(D) An object’s mass compared to its volume On Earth we can sometimes use weight for mass.

IV Density Facts Things with HIGH Density: Bowling Ball Shot put Big Marble Things with LOW Density: Soccer Ball Soft Ball Ping Pong Ball

I Density(D) Terms Mass = how many atoms is in an object (kind of like weight) Volume = how much room (space) an object occupies. Matter = anything has mass and volume.

I Density(D) Terms Mass = grams (or kilograms) Volume = milliliters (ml) or cubic centimeters (cc or cm3) , liters (L)

II Density Definition(def) Density = how much stuff (matter) is in an object’s volume. Density = mass divided by volume D = M (mass) D = V M V (volume)

II Density Definition(def) M D V x

III Measuring Density MASS-use a balance scale Volume- Calculate volume: (L x W x H) length x width x height Volume- Example: 10 cm x 5 cm x 2 cm = 100cm3

III Measuring Density MASS-use a balance scale Volume- Displacement: put object in a graduated cylinder and see how much the water level rises.

III more-Measuring Density 15 ml add marble 20ml What is the difference? This is the volume of the marble. 20 ml 15 ml

IV more- Density Facts Pure water (H2O) has a density of 1.0 g/cm3 That means: 1 gram of H2O has a volume of 1 cm3 1 cm3 = 1 ml = 1 g of H2O

Why do things float?

Why do things float?

Why do things float? Mass = 42,116,363 Kg

Why do things float? Mass = 42,116,363 Kg Volume = 44,070,909 L It is bigger than it is heavy So it will float

Hey…what’s all that stuff floating out there…it must have a low density…let’s not worry about it.?

Ouch!

Yikes! Mass = 42,999,363 Kg Volume = 44,070,909 L Yikes…the mass is increasing due to water inflow But the volume is staying the same! D =42.9 / 44.0 =.97

Yikes! Mass = 43,256,363 Kg Volume = 44,070,909 L Yikes…the mass is increasing due to water inflow But the volume is staying the same! D =43.2 / 44.0 =.98

Yikes! Mass = 43,943,363 Kg Volume = 44,070,909 L Yikes…the mass is increasing due to water inflow But the volume is staying the same! D =43.9 / 44.0 =.99

Yikes! Mass = 44,060,363 Kg Volume = 44,070,909 L Yikes…the mass is increasing due to water inflow But the volume is staying the same! D =44.0 / 44.0 =1.0

Things float if their density is less than the density of H20 Why do things float? Things float if their density is less than the density of H20

Things sink if their density is larger than the density of H20 Why do things sink? Things sink if their density is larger than the density of H20

Why do things float? Tonnage (gross): 46.328 tons Displacement at time of collision: 48,478 tons (figures vary) Mass = 42,116,363 Kg Volume (displacement) = 44,070,909 L Density = M/V = 42,116,363 Kg / 44,070,909 L = 0.96 Kg/L

Why do things float?

A thing will float if its mass is smaller than its volume. Why do things float A thing will float if its mass is smaller than its volume. A thing will sink if its mass is bigger than its volume

Metric Prefix’s Giga x 1,000,000,000 (billion) Mega x 1,000,000 (million) Kilo x1000 Hecto x100 Deka x10 Meter, Liter, Gram Deci 1/10 Centi 1/100 Milli 1/1000 Micro 1/1,000,000