1. Density and Flotation Task: Given 3 eggs, salt, water, and 3 beakers, make it so that one egg sinks, one egg floats and one egg stays suspended in the middle of the water. Objects sink or float based upon density. If an object is less dense that water (p < 1g/cm 3 ) it will float. If an object is more dense than water (p < 1g/cm 3 ) it will sink.

2. ObjectDensity (g/cm 3 )Sink or Float Aluminum2.7 g/cm 3 Penny7.2 g/cm 3 Gold19.3 g/cm 3 Wood0.85g/cm 3 Sugar1.6g/cm 3 Ice0.917g/cm 3 Baby Oil0.83g/cm 3 Mercury13.94g/cm 3 Will a penny sink or float in liquid mercury?

3. Mercury Video

4. QUIZ: make an 8 item density column. 7 Layer Density Column ObjectDensity g/cm 3 Honey1.42 Light Corn Syrup1.33 Dawn Dish Soap1.06 Water1.00 Vegetable Oil.92 Baby Oil.83 Rubbing Alcohol0.79 You must use 3 solids! Hand in a labeled picture in COLOR! Bring it in for extra credit! Objects generally sink or float based upon density. More dense = sinks Less dense - floats Objects generally sink or float based upon density. More dense = sinks Less dense - floats

5. How much of an Object will Float above Water? Zinc 0.92g/cm 3 7.13g/cm 3 The zinc will sink as its denser than water The zinc will sink as its denser than water The ice floats as its less dense than water The ice floats as its less dense than water But how much is underneath the water? But how much is underneath the water? If 92% is under water then the other 8% is visible! ICE CUBE About 8% visible

6. Just the Tip of the Iceberg!!! Photo via: Adventure-Journal 90% of this ice berg is below water (salt water )

7. Most of an Iceberg is below water! Think about this and ships traveling in the ocean. The TITANIC Most of an Iceberg is below water! Think about this and ships traveling in the ocean. The TITANIC Artistic Rendition of an iceberg. Wiki commons

9. Flotation Problems (Handout) Knock on Wood A branch snaps and falls into a river. It has a density of 0.7g/cm 3, will it sink or float and if it floats how much of it will be visible? Floating Basketball A basketball has a mass of 624g and a volume of 7512cm 3. What percentage of a basketball will be visible above water?

10. Rank each object from the most dense to the least dense: A B C D D E F Most Dense [1] [2] [3] [4] [5] [6] Least Dense