1. Measuring Objective: At the end of this lesson students will understand and be familiar with basic scientific units of measure.

2. Using a Metric Ruler In science a metric ruler is used. The units on a metric ruler are called centimeters (cm) and millimeters (mm).

3. The Marks on a Ruler Each of the long marks on a metric ruler represents one centimeter (cm). Each of the short marks on a metric ruler represents one millimeter (mm). There are 10 small marks or millimeters (mm) in every centimeter (cm).

4. How long are the following lines in millimeters and centimeters? 0.8 8 1.1 11 0.4 4

5. Liquid Measure Scientists use liters (L) and milliliters (mL) to measure liquids. 1000 mL is equal to 1 L

6. Taking Accurate Liquid Measurements When measuring a liquid you must measure at the base of the meniscus.

7. Dry Measure Scientists measure dry material in grams (g) and milligrams (mg). 1000 mg is equal to 1g

8. Temperature Scientists use the Celsius or Kelvin scale to measure temperature.