DENSITY and Which is heavier A basketball Or

DENSITY and

Which is heavier… A basketball? Or a bowling ball?

Which is heavier… A metal block? Or a styrofoam block of the same size?

Size Doesn’t Matter! • Objects that are the same size could have very different masses! • All materials are made of small particles called molecules…

DENSITY • The molecules in different objects are arranged differently. They may be closely packed, like in a heavy metal block…

DENSITY • The molecules in different objects are arranged differently. Or they could be spaced out, like in a styrofoam block.

DENSITY • DENSITY describes how closely packed the particles of an object are. HIGH density LOW density

How does this relate to air? • We know that air has mass… Which means that air is also made of molecules. Air molecules are spread very far apart compared to molecules in a solid, like metal.

How does this relate to air? • Even though air molecules are spread far apart, the air in our atmosphere stretches up over 60 miles! • The air above your head actually weighs about as much as a school bus! It doesn’t crush you, though, because it is pushing on all sides.

How does this relate to air? • This pushing of air is called AIR PRESSURE. • You felt PRESSURE when you were crammed into the tape square. …………. . . . ………… Air at at HIGH LOW. …………. . . . DENSITY also has …………. . . . ………… HIGH LOW PRESSURE …………. . . .

Density Column April 5, 2011 Question: Can we layer liquids based on their densities? Hypothesis: (What do you think will happen? ) Results: (Draw your density column. Label liquids and include which is MOST DENSE and which is LEAST DENSE. ) Alcohol LEAST Dense Oil Water Corn Syrup MOST Dense

Density Columns • If you drew in the molecules for your density column, what would it look like? Closely packed for high density Spread out for low density