Science Connections
Chapter 1 Section 3


1.5 class periods [13] The Metric System The purpose of this section is to explain the basic units of measurements in the metric system. The metric system is a universal system of measurement and allows scientists and people from all over the world to compare and analyze data. Students will learn that the basic unit of metric length is the meter (m); of liquid volume is the liter (L); of solid volume is the cubic centimeter (cm^{3} or cc); of mass is the kilogram (kg); of density is grams per milliliter (g/mL); of metric temperature is Celsius degrees (¥ C). Students will also learn the skill of dimensional analysis, or converting from one metric unit to another. The themes that can be focused on in this section are scale and structure and stability. Scale and structure: Point out that the metric system is a decimal system in which units increase or decrease by powers of 10. Stability: Sometimes scientists must compare substances based on their mass and volume. The relationship between mass and volume is called density, and the density of a substance is constant. Performance Objectives 13
Science Terms 13 Metric system, p.20 Meter, p.20 Centimeter, p.21 Millimeter, p.21 Kilometer, p.21 Liter, p. 21 Milliliter, p.21 Cubic centimeter, p.21 Kilogram, p.22 Gram, p.22 Milligram, p.22 Density, p.22 Celsius, p.23 Dimensional analysis, p.23 Conversion factor, p.23 Have students study Figure 115, p.20 for test.

