Class Notes 3: The Metric System Always use the Metric System in science!

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Presentation transcript:

Class Notes 3: The Metric System Always use the Metric System in science!

1. Units  In the Metric System, each type of measurement has a basic unit  Length: meters  Mass: grams  Temperature: degrees Celsius  Volume: liters  Time: minutes

2. Length  1 kilometer (km) = 1000 meters (m)  1 meter= 100 centimeters (cm)  1 cm= 10 millimeters (mm)  1 mm= 1000 micrometers (µm) The metric system uses meters, not feet and inches!

3. Volume: The amount of space it takes up  length x width x height  1 milliliter (mL) = 1 cm cubed  1 Liter (L) = 1000 mL  Use water displacement to calculate volume of an odd shaped item!  Use a graduated cylinder to measure liquids, not a beaker, because the markings are more accurate!

4. Mass: the amount it weighs  1 gram (g) = 1000 milligrams (mg)  1 kilogram(kg) = 1000 grams  1 metric ton(t) = 1000 kilograms  Use a digital scale or triple beam balance

5. Density: a measure of mass per unit of volume  mass/ volume  Grams/ milliliters

6. Temperature  Fahrenheit to Celsius C= 5/9 (F -32)  Celsius to Fahrenheit F= (9/ 5 C) Celsius is freezing! 100 is boiling!!!!

Summary What system of measurement do we use in biology? What are the basic units for length, mass, time, and temperature?