A Golf Ball is MORE DENSE than a Ping Pong Ball

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Presentation transcript:

A Golf Ball is MORE DENSE than a Ping Pong Ball What is DENSITY?? A Golf Ball is MORE DENSE than a Ping Pong Ball What does this mean?

Density is the measure of the _______________ of a material The ______________ of like atoms or molecules More than just the _____________of a substance, density includes _________________ an object takes up!! All substances have density including liquids, solids, and gases Bread slice and compacted bread in large flask of water

DENSITY Depends on: Mass usually expressed in ________ Volume: ___________________________________ FORMULA: __________________ Mass usually expressed in ________ Volume usually expressed in _____ or liters, etc.

What would take up more space. A kilogram of feathers… What would take up more space??? A kilogram of feathers….. or a kilogram of steel?? ROCKS - pass around OR

“Compactness” Hot air balloon - Describe how a hot air balloon works. Defend your argument.

LIQUIDS The more dissolved solids in a solution, the __________________ (such as ocean water) Cold water in lakes tend to ______ (this creates a constant mixing of water, nutrients, and other substances) Straw solute Denser layers to less dense layers…..

What would happen???? Mercury density = 13600kg/m3 Lead density = 11340kg/m3 Sinking vial - make it float

Lead floats on liquid mercury!

Solids Ice vs. water…..

SOLIDS Ice is _____________ 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 Beans/ping pong ball; Big jug of water in a pool Wouldn’t you like to have a bunch of THIS dense material?

Factors affecting Density ____________________ _____________________ Add several drops of red food color to each of two 250-mL Erlenmeyer flasks; fill them with warm tap water. (If tap water is not warm, heat some tap water on a hot plate to 40-45 °C.) Add several drops of blue food coloring to each of the other two 250-mL Erlenmeyer flasks; fill them with cool tap water. Predict the outcome when one flask is inverted over the other. Place a paper card on top of the vessel filled with warm water. Invert the flask making sure to hold the card in place. Stack it on top of one of the cool water flasks. Remove the card. Remain prepared to catch the flasks. ** Visual here. Place a paper card on top of the flask filled with cool water. Invert the flask making sure to hold the card in place. Stack it on top of the other warm water flask. Remove the card. Wide mouth containers may also be used.

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