metric system
DESCRIPTION
TRANSCRIPT
Introduction to Matter and the Metric System
7th Grade Physical Science
Mr. Riordan
What is Matter?
• Matter is all things that we can see, touch, and smell in our daily lives.
• Matter is what the universe is made of
• We are made of matter
• Matter has properties.
• A property is a characteristic of something that helps identify it, and which makes it unique.
• Properties describe an object.
Properties of Matter
• There are some properties of matter.
• These properties are mass, weight, volume, and density.
• Our working definition of matter is any substance that has mass and volume
MASS
• Mass is the amount of matter in an object.
• Mass is constant
• It cannot be changed unless you add or remove matter from an object.
• The metric units that are used to express mass are the gram (g), milligram (mg), and the kilogram (kg).
• The amount of space an object takes up or occupies is called its volume.
• The metric units that are used to express volume are the liter (L), milliliter (mL), and the cubic centimeter (cm3).
• Liters and milliliters are used to measure the volume of liquids.
• Cubic centimeters are used to measure the volume of solids.
History of the Metric System
• Developed in Lyon, France, ~1670
• Created to make consistent units for measurement
• Based on “powers of 10”…what does this mean?
The Basic Metric Units
• Meter: base unit for length
• Liter: base unit for volume
• Gram: base unit for mass
Powers of 10
• Prefixes in front of the base unit tell if the measurement is greater or less than the base unit.
• Each prefix is a factor of ten.
• This makes it easy to convert between units.
How big is a ….• Kilometer? 1000x larger then a meter
• Meter? Height of a standard countertop
• Centimeter? 100x smaller then a meter, the width of a dime
• Millimeter? 1000x smaller then a meter, the thickness of a dime
Metric Prefixes
Kilo
1000x
Kilo
1000 X larger
Hecto
100 Xlarger
Deka
10 X larger (no prefix)
Meter Liter Gram Deci
One Tenth1/10
CentiOne
Hundreth1/100
MilliOne
Thousanth1/1000
Larger
Smaller
Base Units
Using a Ruler
What is the length of the blue arrow?
Using a Ruler
ALWAYS measure with the starting point at the “0” mark!
Kilometer - km
• 1000 times larger than a meter.
• 12 blocks less than a mile.
• Main span of GW bridge
Hectameter - hm
• 100x larger than a meter.
• Height of Statue of Liberty from base to torch
Decameter - dam
• 10 x larger than a meter
• Length of a school bus
Meter - m
• Length of a meter stick.
• Height of a counter top
Decimeter - dm
• 10x smaller than a meter.
• Height of a can of soda.
Centimeter - cm
• 100x smaller than a meter
• ½ width of a dime
Millimeter - mm
• 1000x smaller than a meter
• The thickness of a dime
Micrometer - um
• 1,000,000x smaller than a meter.
• diameter of a bacteria cell
Nanometer - nm
• 1,000,000,000x smaller than a meter.
• Thickness of a DNA molecule.
Kilogram - kg
• 1000x heavier than a gram
• Mass of a liter of orange juice.
Hectogram - hg
• 100x heavier than a gram.
• Mass of a stick of butter.
Decagram - dkg
• 10 x heavier than a gram
• Mass of 2 nickels
Gram - g
• Mass of a paper clip
Decigram - dg
• 10 x lighter than a gram.
• Mass of 10 grains of salt
Centigram - cg
• 100x lighter than a gram.
• Mass of a single grain of salt.
Milligram - mg
• 1,000x lighter than a gram.
• Mass of a mosquito
Microgram - ug
• 1,000,000x lighter than a gram
• Mass of a flour particle
Nanogram - ng
• 1,000,000,000x lighter than a gram
• Mass of a human cell.
Kiloliter - kL
• 1000x larger than a liter
• Volume of a fridge
• 1,000,000 cm3
Hectoliter - hL
• 100x larger than a liter.
• 100,000 cm3
• Volume of two kitchen trashcans
Decaliter - dkL
• 10 x larger than a liter.
• 10,000 cm3
• Volume of 3 gallons of milk
Liter - L
• 100 cm3
• Volume of 3 cans of soda
Deciliter - dL
• 10x smaller than a liter.
• 100 cm3
• Volume of a dixie cup
Centiliter - cL
• 100x smaller than a liter
• 10 cm3
• 2 tablespoons of liquid
Milliliter - mL
• 1000x smaller than a liter
• 1 cm3
• Volume of a cube of sugar
Microliter - uL
• 1,000,000x smaller than a liter
• 0.001 cm3
• Crystal of table salt
nanoLiter - nL
• 1,000,000,000x smaller than a liter.
• 0.000001 cm3