Measurement Part 1

Why Measure? Measurement is important because our eyes can deceive us. Scientists use the International System of Units (SI). Advantages of SI: 1. It helps scientists share and compare their results. 2. All units are based on the number 10 which make conversions easy.

Units Measurement Base UnitSymbol length meter m volume liter L mass gram g time second s temperature degree Kelvin K

Choosing a Unit A measurement must always include a number and a unit. 125 cm The unit depends on the size of the object. For example: What unit would you use for the length of a pencil? For the distance between cities?

Length The SI base unit for length is the meter. Metric rulers and meter sticks are used to measure length.

Using Meter Sticks Each number on a ruler or meter stick represents a centimeter.

Using Metric Rulers What do the tiny lines between the centimeters represent? They represent millimeters or 1/10 of a centimeter.

LET’S TRY IT!!!!