WHAT IS DENSITY AND HOW IS IT MEASURED?

WHAT IS DENSITY AND HOW IS IT MEASURED?

BYMr. ABRAHAM FUNCHESS

JOHN FORD MIDDLE SCHOOLSaint Matthews, SC

803.655.7222

04/20/23 Abraham Funchess, JFM 2

OUR DIRECTOR

Whiz kids, staff, parents, and stakeholders of Calhoun County Public Schools salute you, Dr. Jane Zenger, USC Pathways Project Director, for including us as Pathway partners in a plethora of challenging inquiry-based activities.


INTRODUCTION • WHICH DO YOU THINK IS HEAVIER, A KILOGRAM

OF COTTON OR A KILOGRAM OF IRON? • ANS: THEY BOTH WEIGH THE SAME. • HOWEVER, A KILOGRAM OF COTTON TAKES UP A

GREATER AMOUNT OF SPACE OR VOLUME. • A KILOGRAM OF IRON TAKES UP LESS SPACE

BECAUSE IRON HAS A MUCH GREATER DENSITY THAN COTTON.

• SUBSTANCES LIKE IRON ARE HEAVY FOR THEIR VOLUME AND ARE CALLED DENSE SUBSTANCES.


SC STANDARD 6-1

• USE APPROPRIATE TOOLS AND INSTRUMENTS (INCLUDING A SPRING SCALE, BEAM BALANCE, GRADUATED CYLINDER), SAFELY AND ACCURATELY WHEN CONDUCTING A CONTROLLED SCIENTIFIC INVESTIGATION.


TOOLS PURCHASED THROUGH USC PATHWAY PROJECT

Platform Balances/Graduated Cylinders


LEARNING OBJECTIVES MASTERED

• STUDENTS DEFINED DENSITY.• STUDENT EXPLAINED HOW TO FIND THE DENSITY.• STUDENTS COMPUTED THE DENSITY OF REGULAR

AND IRREGULAR OBJECTS.• STUDENTS USED DENSITY TO EXPLAIN WHY ONE

SUBSTANCE FLOATS ON TOP OF ANOTHER.


FACTS OF DENSITY EXPLORED

• DENSITY IS A PHYSICAL PROPERTY OF MATTER. • EVERY KIND OF MATTER HAS A DENSITY THAT CAN BE

MEASURED. • THE DENSITY OF A PURE SUBSTANCE IS ALWAYS THE

SAME. • DENSITY DOES NOT DEPEND ON SIZE OR SHAPE OF

THE SUBSTANCE. • DENSITY CAN BE USED TO HELP IDENTIFY DIFFERENT

KINDS OF MATTER. • IF YOU KNOW THE DENSITY OF A SUBSTANCE, YOU

CAN IDENTIFY IT.


KEY TERMS TO KNOW

• DENSITY IS THE MASS PER UNIT VOLUME OF AN OBJECT.

• MASS IS THE AMOUNT OF MATTER THAT AN OBJECT HAS.

• VOLUME IS THE AMOUNT OF SPACE THAT AN OBJECT OCCUPIES.

• GRAM IS THE BASIC UNIT OF MASS IN THE METRIC UNIT.

• CENTIMETER IS A UNIT OF MEASUREMENT IN THE METRIC SYSTEM.


DENSITY OF A REGULAR OBJECT

• YOU CAN FIND THE DENSITY OF A REGULAR OBJECT IF YOU KNOW ITS MASS AND VOLUME.

• YOU CAN USE A BALANCE TO FIND THE MASS OF A REGULAR OBJECT.

• ONE CAN FIND THE VOLUME OF A REGULAR OBJECT BY MULTIPLYING ITS LENGTH BY ITS WIDTH BY ITS HEIGHT.

• NEXT, DIVIDE THE MASS OF THE OBJECT BY ITS VOLUME TO FIND ITS DENSITY.


SOLUTION

• DENSITY = MASS• VOLUME• D = M• V• D = 34.5 g• 122.5 cm3

• D = .282 g/cm3

VOLUME = L x W x H


AN ALUMINUM BAR OF VOLUME 100 cm3 HAS A MASS OF 270 g.


CALCULATION

• DENSITY = MASS ÷ VOLUME• DENSITY = 270 g ÷ 100 cm³ • DENSITY = 2.7 g/cm³


CHECKING CONCEPTS

1. DENSITY IS THE ____ PER UNIT VOLUME OF A SUBSTANCE.

2. THE UNITS OF _____ ARE EXPRESSED IN GRAMS PER CUBIC CENTIMETER.

3. WHAT MEASUREMENTS MUST BE KNOWN IN ORDER TO FIND THE DENSITY OF A SUBSTANCE?


ANSWERS

1. MASS2. DENSITY3. MASS AND VOLUME


PUTTING IT ALL TOGETHER

10 cm

2 cm

1. WHAT IS THE VOLUME OF THE BAR?2. IF THE BAR HAS A MASS OF 500 g, WHAT IS THE

DENSITY?


ANSWERS

1. 400 cm³2. 500 g ÷ 400 cm³ = 1.25 g/cm³


FIND THE DENSITY, IDENTIFY THE SUBSTANCE

• BLOCK 1 _______________• Mass = 79.4 grams

• Volume=29.8 cubic cm.

• BLOCK 2 _______________• MASS= 25.4 grams • VOLUME=29.8 cubic cm.


FINDING THE DENSITY OF IRREGULAR OBJECTS

USE THE WATER DISPLACEMENT METHOD TO FIND THE VOLUMN OF IRREGULAR OBJECTS. MEASURE LIWUID VOLUMES CAREFULLY.


Jaquan is concentrating on his density column that lines up with density measurements of various liquids.


Teacher Funchess and Dr. Zenger observe the techniques of Joseph, Jaquan, Xavier and Richard used in measuring and weighing their blocks.


Richard is observing liquids with varied densities jockeying for their rightful positions.


Messiah is observing liquids with varied densities jockeying for their rightful positions.


Dr. Zenger gives Henry a few pointers on reading a graduated cylinder.


Christian is observing liquids with varied densities jockeying for their rightful positions.


Teacher, Abraham Funchess, gives a few tips to Brian on using a platform balance


Stepney’s calculations revealed that milk has a greater density than two other liquids.


Dr. Zenger looks over the shoulders of Brian and Stepney who are using the water displacement method to find the density of their rocks.


GIRLS OF A SINGLE GENDER CLASS GET INVOLVED TOO..

• Phyllis K. Carey CEO PC Solutions C2 Educational Services, shows Daneisha how ultraviolet light effects white beads during one of her visits.



• Phyllis K. Carey CEO PC Solutions C2 Educational Services, demonstrates for Rashandra and Hope how white beads reacts to ultraviolet light during one of her visits.



• Phyllis K. Carey CEO PC Solutions C2 Educational Services, helps Shante, Kathleen and Hope summarize the results of an investigation on the effect of ultraviolet light on white beads.



• Phyllis K. Carey CEO PC Solutions C2 Educational Services, Hope, Shante, Kathleen and Daneisha interpret data recorded during an investigation with ultraviolet light on white beads.


BENEFITS OF PROJECT INCLUDE…….

• HAVING FUN WHILE LEARNING HOW TO FIND AND CALCULATE DENSITY OF REGULAR AND IRREGULAR OBJECTS…

• INCREASING MATH AND SCIENCE SKILLS NEEDED IN THIS 21ST CENTURY..

• FOCUSING ON HANDS-ON ACTIVITIES• LEARNING TO USE EQUIPMENTS THAT ARE PACT

TESTED…


STUDENTS SPEAK OUT ABOUT PROJECT

MELNDA SAID, “WE LEARNED HOW TO MEASURE DIFFERENT OBJECTS.”

JESUS SAID, "IT WAS AN EXCITING PROJECT.”

DEVONTE SAID, ”I LEARNED WHY SOMETHINGS FLOAT AND OTHERS SINK.”

ABRAHAM SAID, “I HAD FUN MEASURING AND WEIGHING OBJECTS.”

KIjOHN SAID, “THIS PROJECT TAUGHT ME HOW TO DO THE WORK OF REAL SCIENTISTS.”

JOSEPH SAID, “IT HELPS ME ENJOY AND LEARN SCIENCE IN A FUN WAY.”


PORTABILITY OF PROJECT• EASY TO DO WITH LITTLE INITIATIVE, EVEN AMONG

ELEMENTARY STUDENTS….• A “MUST DO PROJECT” IN ANY COMMUNITY SCHOOL..• MATH PROCESS SKILLS CAN BE USE IN ALL ACADEMIC

DISCIPLINES ..• DENSITY CENTERS COULD BE SET UP IN ALL CLASSES WITH

ONE OR TWO BALANCES AND RULERS AS NEEDED TO REINFOCE CONCEPT..


HELPFUL RESOURCES• “BUOYANCY”• “MASS VOLUME AND DENSITY”• “MEASURING MATTER”


HELPFUL LINKS…• http://www.visionlearning.com/library/module_viewer.php?

mid=37• http://www.elmhurst.edu/~chm/vchembook/120Adensity.ht

ml• http://www.hazelwood.k12.mo.us/~grichert/explore/dswme

dia/density.htm• http://www.edinformatics.com/math_science/density.htm• http://www.zyra.org.uk/density.htm

http://www.visionlearning.com/library/module_viewer.php?mid=37

http://www.visionlearning.com/library/module_viewer.php?mid=37

http://www.elmhurst.edu/~chm/vchembook/120Adensity.html

http://www.elmhurst.edu/~chm/vchembook/120Adensity.html

http://www.hazelwood.k12.mo.us/~grichert/explore/dswmedia/density.htm

http://www.hazelwood.k12.mo.us/~grichert/explore/dswmedia/density.htm

http://www.edinformatics.com/math_science/density.htm

http://www.zyra.org.uk/density.htm


WHETHER WE ARE TALKING ABOUT…..

• EGGS FLOATING OR SINKING IN WATER

• COLUMNS OF LIQUIDS SUSPENDED ABOVE EACH OTHER

• THE AGE OLD QUESTION OF “WHICH IS HEAVIER, A KILOGRAM OF GOLD OR A KILOGRAM OF FEATHERS?”

•THE CONCEPT OF DENSITY HAS ALWAYS FACINATED MEN AND IS ONE PROPERTY SCIENTISTS USE TO IDENTIFY OBJECTS.


THANK YOU DR ZENGER AND THE “USC PATHWAY PROJECT”

•“YOU HAVE EMPOWED US WITH THE TOOLS NEEDED TO COMPLETE A CHALLENGING HANDS-ON ACTIVITY.”

WHIZ KIDS OF JOHN FORD MIDDLE SCHOOL GENERAL SCIENCE

WHAT IS DENSITY AND HOW IS IT MEASURED?

Documents

gcmabraham funchess

density of regular

greater density

facts of density

unit volume

x w x habraham funchess

basic unit of mass

mass volumedensity