# Measurement-A Common Language - PC\|MAC Measurement-A Common Language Length A Standard Measurement System The Metric System

When and why was the metric system invented? The metric system was invented in 1790 The metric system was invented because countries were using many different systems of measurement causing confusion and lack of consistency

Who invented the metric system? The metric system was invented by a group of French scientists Scientists all over the world use the International System of Units to measure:

Length Volume Mass

Temperature Time Metric System A system of measurement that is based on the number 10. A Standard Measurement System

The International System of Units (SI) Figure 1: Calculating How much larger is a kilothan a deka-? 100 times Reading Checkpoint (page 45): SI units are based on multiples of what number?

SI units are based on multiples of 10 Add a zero Subtract a zero Key Concept: Why do scientists use a standard measurement system? Using SI as the standard system of

measurement allows scientists to compare data and communicate with each other about their results Using SI measurement also allows experiments to be repeated and most importantly achieve a desired result Length

What is length? Length is the distance from one point to another The basic unit of length in the SI system is the meter The three units that measure the

length of smaller objects are, Decimeter Centimeter millimeter Complete the Table Below Prefix Meaning

Unit of Length milli one-hundredth meter one-thousand

Complete the Table Below Prefix Meaning milli Onethousandth one-hundredth

Unit of Length millimeter meter one-thousand Complete the Table Below

Prefix Meaning Unit of Length millimeter milli

centi Onethousandth one-hundredth centimeter deci

One-tenth decimeter None one meter

Complete the table below Prefix Meaning Unit of Length

deca ten decameter hecto hundred

hectometer kilo thousand kilometer

Length Measuring Length Every ten centimeters is one decimeter. The longer lines on the metric ruler are called centimeters

The smallest lines on the metric ruler are called millimeters Reading Checkpoint (page 48) One centimeter is divided into how many millimeters? 10

millimeters (mm) Figure 2: Calculating: Measure the turtle in figure 2 from the rear of its shell to the tip of its nose. Record its length in both centimeters and millimeters. 10.5 cm

105 mm