The International System of Units (SI Units) Also known as the metric system

Not based on any one particular number... CONFUSING! U.S. Customary System 12 inches in 1 foot 3 feet in 1 yard 4 quarts in 1 gallon Not based on any one particular number... CONFUSING!

The International System of Units The United States is the only industrialized country that does not use SI units

The International System of Units The entire metric system is based on units of 10

Base Units (copy the following chart) Measurement Base Unit Abbreviation Length Meter m Volume Liter L Mass Gram g Time Second s Temperature Degrees Celsius ° C

Metric Prefixes Prefixes indicate which multiple of ten to us kilo- (k)= 1,000 base units hecto- (h)= 100 base units deka- (dk)= 10 base units Base unit (g, m, L, etc.) deci- (d)= 1/10 base unit, so 1 base unit = 10 d__ centi- (c)= 1/100 base unit, so 1 base unit = 100 c___ milli- (m)= 1/1000 base unit, so 1 base unit = 1,000 m___

Large units of Length 1,000 meters = 1 kilometer (km)

Smaller units of Length 100 cm = 1 m 1,000 mm = 1 m 10 mm = 1 cm

*Centimeters, NOT inches! Measuring length Use a meter stick Or a ruler *Centimeters, NOT inches!

Mass Mass is a measure of how much matter something contains

Units of Mass 1,000 grams = 1 kilogram

Smaller units of Mass 1,000 milligrams = 1 gram

Measuring Mass Use a triple-beam balance scale

Start with the middle beam (100s), move to the back beam (10s), and last the front beam (1s). Add them all up

Volume Volume is a measure of the amount of space a piece of matter takes up Ex: Inflated balloon takes up more space than an empty balloon

Units of Volume 1,000 milliliters = 1 liter

Measuring Volume Use a graduated cylinder

Using a graduated cylinder Meniscus: the curve of the surface of the liquid To find the volume of a liquid, read the mark that lines up with the bottom of the meniscus

Mini Quiz How many meters are in a kilometer? 10 100 1000 When measuring the volume of a liquid, you read the line that lines up with the _____ of the meniscus. Bottom Middle Top

The Metric System Video https://www.youtube.com/watch?v=djTNUp4XIRo Brainpop: https://www.brainpop.com/science/scientificinquiry/metr icunits/

King Henry Doesn’t Usually Drink Chocolate Milk