Metric System Measurement

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?

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”

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

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.

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:

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.

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.

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)

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

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