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 1 meter = 100 cm or 1 meter = 1,000 mm Practice Problems 10 cm= ____ mm 5.5 mm= _____ m

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. Practice Problem: 1500g = ____ kg

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

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)

Temperature conversion formulas Fahrenheit to celcius = 5/9(degrees in Fahrenheit – 32) Celsius to Kelvin = Degrees in Celsius

Temperature Celsius to Fahrenheit: Kelvin to Celsius: C= K

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