A Standard Measurement System Unit 1.4: The Metric System

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

Metric System A system of measurement used by the majority of countries on Earth based on the number 10

A Standard Measurement System The International System of Units (SI)

Scientists all over the world use the International System of Units to measure: Length Volume Mass Density Temperature Time

Figure 1: Calculating - How much larger is a kilo- than a deka-? 100 times

Notes Checkpoint: 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 Length is the distance from one point to another The basic unit of length in the SI system is the … The basic unit of length in the SI system is the meter

The two units that measure the length of smaller objects are, … millimeter centimeter

Complete the Table Below PrefixMeaningUnit of Length milli one-hundredth meter one-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandth one-hundredth meter one-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter one-hundredth meter one-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredth meter one-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter meter one-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter nonemeter one-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter noneonemeter one-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter noneonemeter kiloone-thousand

Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter noneonemeter kiloone-thousandkilometer

Length Measuring Length

The longer lines on the metric ruler are called… centimeters The shorter lines on the metric ruler are called… millimeters

Notes Checkpoint: 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 front. Record its length in both centimeters and millimeters. 8.8 cm 88 mm

Measurement-A Common Language Mass (Weight)

The basic unit of mass in the SI system is the… The basic unit of mass in the SI system is the kilogram.

What are three objects whose masses would be measured in kilograms. Car Teacher’s Desk Desk Top Computer

A smaller object’s mass such as a paper clip would be measured in Smaller objects such as a paper clip would be measured in milligrams.

Conversions 1 kg=g 1 g=mg

Conversions 1 kg=1,000g 1 g=mg

Conversions 1 kg=1,000g 1 g=1,000mg

Measurement-A Common Language Volume

When measuring the volume of a liquid, scientists use a unit known as the… Liter (L). 2 L bottle

To measure the volume of smaller liquids, the _________ is used. Milliliter (mL) Graduated Cylinder

This instrument has markings that are in increments of… 1 milliliter (mL)

Meniscus The curve in the top surface of water in the graduated cylinder

Figure 4: Observing - What is the proper way to read a meniscus? Read the milliliter marking at the bottom of the curve

Common Conversions For Volume 1 L= =1,000 cm³ 1 mL=

Common Conversions For Volume 1 L=1,000 mL =1,000 cm³ 1 mL=

Common Conversions For Volume 1 L=1,000 mL 1 L=1,000 cm³ 1 mL=

Common Conversions For Volume 1 L=1,000 mL 1 L=1,000 cm³ 1 mL=1 cm³

Using the Metric Staircase method for conversions. Go Smaller Go Larger Let’s Try One: 4030 mm = ? m Climb 3 steps so move the decimal 3 places to the left, so: 4.03 m