DENSITYPre-Lab Cornell Notes

DENSITY What is density?

A measure of how tightly packed together particles in an object are

Mass Per Unit VolumeD= m/v

MEASURING MASS SI unit of mass is the…

Mass ≠ Weight

We can measure an object’s mass using a triple beam balance OR electronic scales

MEASURING VOLUME V= l x w x h

Volume is a derived unit

Units are cm3 or mL1 cm3 = 1 mL

MEASURING VOLUME The volume of regular-shaped objects

can be found using a metric ruler to measure l, w, and h

The volume of irregular-shaped objects can be found using water displacement

MEASURING VOLUME Drop the object in

a graduated cylinder of water of a known volume

Determine the change in water height by reading the meniscus

meniscu

s

DENSITY DISPLACEMENT Watch the displacement animation,

then write 4-5 easy steps for finding the density of an irregular-shaped object 1.

2.

3.

4.

Rubber Stopper Animation

DENSITY PRACTICE PROBLEMS Mrs. Hendee eraser has a mass of

25g and a volume of 24 cm3. What is the density of the eraser?

My physical science textbook has a volume of 1000 cm3 and a mass of 5000g. What is the density of the textbook?

DENSITY PRACTICE PROBLEMS

Mrs. Hendee’s stapler has a mass of 543g. When it is placed in 500 mL of water, the meniscus raises to 875 mL. What is the density of the stapler?