1. Metric System Measurement

2. Bell Ringer
The Metric Conversion Act of 1975 determined that the metric system would be the system of measurement used for US Trade & Commerce. Why do you believe this act was passed?

3. History of the Metric System
After the French Revolution, Louis XVI put a group of scientists to create a unified system of measurement.
The SI System gives credit to the French because it stands for
“Systeme International d’unites”

4. Length Length is the distance between 2 objects
A meter stick measures length

5. Mass Amount of matter in an object
Mass is measured with a triple beam balance
Grams is the basic unit of mass
Weight is not Mass because weight is affected by gravity.

6. Volume Is the amount of space an object occupies
If it’s a solid = cm3. If it’s a liquid= mL
Solid= Calculate LxWxH
Liquid= Grad. Cylinder
Practice Problem:

7. Write down an example of two substances and compare their densities.
Today’s Bell Ringer
By saying a particular substance is more dense or less dense, what does this imply?
Write down an example of two substances and compare their densities.

8. Density
Heaviness of objects. Compare a rock to a crumbled piece of paper. The rock is more dense than the paper.
Formula for Density = Mass/Volume
Practice Problem: Calculate the density in g/mL of aluminum if a 50 mL block weighs135 g.

9. Temperature
Measure of the average kinetic energy of the particles in a sample of matter
Measured in Celsius, Use a thermometer
Therm= heat, meter= measure
Convert 75 degrees Fahrenheit to Celsius
5/9(degrees in Fahrenheit – 32)

10. Conversion Factor Start with what’s given Find a conversion factor
Numerator (unit that matches answer)
Denominator (unit that matches given #)
Multiply Across and then divide

11. CW/HW: RQ SI System Part 2
1. The unit kilograms implies we are measuring?
2. Cm3 implies we are measuring the volume of a ____?
3. Measure the volume of your desk:
Length b. Width c. Height
4. Greater mass? 45.7mL of a liquid or 27.8 mL of that same liquid