1.3 Notes Derived Units.

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Presentation transcript:

1.3 Notes Derived Units

Derived Units Derived units—cannot be measured with one SI base unit…it is a combination of units Speed: m/s or meters/second Volume of a cube: (L x w x h = )m3 or cm3 Density: g/cm3

Mass vs. Density Which weighs more a pound of lead or a pound of feathers? They are the same….1 pound! Which would have a greater volume, a pound of lead or a pound of feathers? A pound of feathers would take up more space. Which has a greater density, lead or feathers? Which has its molecules more closely compacted? Lead has smaller volume for same mass.

Density Density—the ratio of mass to volume. Mass—the amount of matter that comprises an object; measured in grams. Volume—the amount of space that a piece of matter occupies; measured in liters (l), milliliters (ml), cubic centimeters (cm3) Different units for solids vs. liquids vs. gases Formula for density: d = m/v Density CANNOT be directly measured…must be calculated

More on Density High density objects have a large mass compacted into a small space. For example: Low density objects have a small mass spread over a large space.

Why??

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