1. Metric System & SI Units
Measurements
Metric System & SI Units

2. Measurements Measurement is a way to describe the world with numbers.
Length, volume, mass, and temperature are used to describe objects and events.

3. The U.S. still uses the English system of measurement.

4. Words we DO NOT use in science class.

5. Metric System
Scientists use the metric system which is the International System (SI)Units, of measurement.
The metric system is based on units of ten.

6. Units To help remember the prefixes in order:
King Henry Died [By] Drink Chocolate Milk
kilo- hecto- deka- [Base unit]  deci-  centi-  milli-

7. Converting Units
To convert to a larger unit move the decimal place to the left.
To convert to a smaller unit move the decimal place to the right.

8. Metric conversion rap

9. Metric System

10. Length The meter is the basic SI unit of length.
A meter stick is used to measure length.

11. Length
Smaller objects can be measured in centimeters (cm) or millimeters (mm).
Ex: pencil and textbook
To measure long distances, you use kilometers (km).
Ex: distance traveled in a car

12. Mass Mass is the amount of matter in an object.
The kilogram (kg) is the SI unit for mass.

13. Mass
You can determine mass with a triple-beam balance.

14. Weight Weight is a measure of the pull of gravity on an object.
WEIGHT AND MASS ARE NOT THE SAME!
The weight of the object can change, but the mass remains the same.

15. Volume Volume is the amount of space an object takes up.
The basic SI unit of volume is a liter (L).

16. Volume A graduated cylinder is used to measure the volume of a liquid.
Volume can be measured in cubic centimeters (cm³) or milliliters (mL).

17. Reading A Graduated Cylinder
The curved surface of a liquid is called the meniscus.

18. Temperature
Temperature is a measure of the average kinetic energy of an object.
Temperature is measured with a thermometer.

19. Temperature Scientists use the Celsius scale to measure temperature.
Freezing point of freshwater is 0⁰C.
Boiling point of freshwater is 100⁰C.

20. Temperature Zero Kelvin (0K) is called absolute zero.
Absolute zero is the lowest possible temperature where
nothing could be colder.

21. Scientific Notation
Scientific notation is a way to represent very large and very small numbers.
If it moves to the left, then the power is positive.
If it moves to the right, then the power is negative.

22. Scientific notation song

23. Write in scientific notation
Ex. 1:
Ex. 2:
Ex. 3:
Express 5.43 x 10-3 as a number.