Introduction to Matter and the Metric System 7 th 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 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 (cm 3 ).
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 Larger Smaller Base Units Kilo 1000 X larger Hecto 100 X larger Deka 10 X larger (no prefix) Meter Liter Gram Deci One Tenth 1/10 Centi One Hundreth 1/100 Milli One Thousanth 1/1000
Using a Ruler
What is the length of the blue arrow?
Using a Ruler
ALWAYS measure with the starting point at the “0” mark!