Review from Yesterday What is the Scientific Method? What are the steps of the scientific method? Define hypothesis. Why do scientists communicate their results? Do you perform a method of solving problems?
Section 3 Measurement Key Concepts Why is scientific notation useful? What units do scientists use for their measurements? How does the precision of measurements affect the precision of scientific calculations? The Metric System
Measurements The oldest known record of measurements is about 10,000 yrs. old (found in Africa) Because not many humans were able to measure, they all used the same system. When everyone agrees to the same units it is called Standard Units
The International System of Units (SI system) Developed in France in 1799 has units for all types of quantities unit is written after the number
The International System of Units (SI system) Weight = 125 What? pounds, Newton's, zebras MUST include UNITS to make it more understandable. 125 pounds
The International System of Units (SI system) SI system works by combining prefixes and base units. Each base unit can be used with different prefixes to define larger or smaller quantities.
The International System of Units (SI system) Prefixes Kilo Hecto Deca Base unit Deci Centi Milli 1000x 100x 10x 0 0.1x 0.01x 0.001x Kids Have Dropped Over Dead Converting Metrics Meter or Liter or Gram
Measuring Quantities in SI Base Units Length Volume Mass Temperature
Length Length (distances) are measured in Meters (m) Meter stick is equal to 1 meter Units are created by attaching prefixes 1 Kilometer, 1 millimeter, 1 centimeter 1000 m.001m.01m
Volume Is how much space an object takes up Measured in Liters (L) 2 ways to find volume Mathematical – Length x Width x Height Displacement – Demonstrate using graduated cylinder KL, mL, L
Mass Is the measure of the amount of matter in an object Measured in Grams (g) Mass is NOT WEIGHT Use a balance to find mass
Temperature degrees Celsius ( o C) is used to measure temperature A thermometer is used Water freezes at 0 o C and boils at 100 o C There is no prefix used for temperature
How do you convert in the Metric System? How many millimeters are there in 2.5 Kilometers? 1 st – set up the prefixes Kilo Hecto Deca O Deci Centi Milli
How do you convert in the Metric System? 2 nd – set up what you have to convert Kilometers to millimeters 3 rd – Look at your prefixes again Kilo Hecto Deca O Deci Centi Milli
How do you convert in the Metric System? 4 th – count how many spaces separate the two prefixes Kilo Hecto Deca O Deci Centi Milli
How do you convert in the Metric System? 4 th – count how many spaces separate the two prefixes Kilo Hecto Deca O Deci Centi Milli 1
How do you convert in the Metric System? 4 th – count how many spaces separate the two prefixes Kilo Hecto Deca O Deci Centi Milli 2
How do you convert in the Metric System? 4 th – count how many spaces separate the two prefixes Kilo Hecto Deca O Deci Centi Milli 3
How do you convert in the Metric System? 4 th – count how many spaces separate the two prefixes Kilo Hecto Deca O Deci Centi Milli 4
How do you convert in the Metric System? 4 th – count how many spaces separate the two prefixes Kilo Hecto Deca O Deci Centi Milli 5
How do you convert in the Metric System? 4 th – count how many spaces separate the two prefixes Kilo Hecto Deca O Deci Centi Milli 6
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km 2.5
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km 25.
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km 250.
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km 2500.
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km
How do you convert in the Metric System? 5 th – move the decimal the same amount of spaces in the same direction you moved Kilo Hecto Deca O Deci Centi Milli 6 spaces 2.5 km = mm 2.5 km = 2,500,000 mm
How do you convert in the Metric System? How many grams are there in 450 centigrams?
In-Class Work 25 L = __________ mL 20 mg = _________cg 120 m = ___________km 567 cm = __________mm 45 kL =___________L km = ________ cm
Homework Metrics Worksheet