 # Introduction to SI (International System of Measurements)

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Introduction to SI (International System of Measurements)

What is the metric system? The first standardized system of measurement, based on the decimal (powers of ten) was proposed in France about 1670. It was created to develop a unified, natural, universal system of measurement. (Standardized) In 1790 King Louis XVI of France assigned a group to begin this task. At that time, every country had their own system of weights and measures. England had three different systems just within its own borders!! It was called the "metric" system, based on the French word for measure. As of 2005, only three countries, the United States, Liberia, and Myanmar, have not changed over to the metric system. The official modern name of the metric system is the International System of Units or abbreviated SI.

What are the metric measurements that we are learning about? Meter –Distance/Length Liter –Volume – how much space an object occupies. Gram –Mass – how much matter in an object.

Base Unit: Meter Distance/Length

English vs. Metric Units 1.6 kilometers 1 mile 1 yard = 0.9444 meters 1 inch = 2.54 centimeters

How to remember different lengths in the metric system: When you think of a millimeter (mm) think of: –The thickness of a dime. When you think of a centimeter (cm) think of: –The width of your pinky.

How to remember different lengths in the metric system: When you think of a meter (m) think of: –The height of the doorknob. When you think of a kilometer (km) think of: –A little more than half of a mile

Lesson 2: Gram Mass

English vs. Metric Units 1 pound = 453.6 grams 100 kilogram = 220 pounds 1 ounce of gold = 28,349.5 milligrams

How to remember different masses in the metric system: When you think of a gram (g) think of: –A paper clip When you think of a kilogram (kg) think of: –A little more than 2 pounds.

Measuring Mass A triple-beam balances is used to find the mass of various objects. The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right-side of the scale to match up.

Lesson 3: Liter Volume

English vs. Metric Units 1 gallon = 3.79 liters It would take approximately 3 ¾ 1-liter bottles to equal a gallon. 1 fl oz = 29.573 ml 1 12-oz can of soda would equal approximately 355 ml. 1 quart = 0.946 liters

How to remember different volumes in the metric system: When you think of a liter (L) think of: –About the size of a bottle of water. When you think of 5 milliliters (mL) think of: –One teaspoon When you think of 2 kiloliters (kL) think of: –A hot tub

Measuring Volume We will be using graduated cylinders to find the volume of liquids and other objects. Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water. What causes the meniscus? A concave meniscus occurs when the molecules of the liquid attract those of the container. The glass attracts the water on the sides.

Measuring Solid Volume We can measure the volume of irregular object using water displacement.

Introduction to SI (International System of Measurements)

KILO 1000 Units HECTO 100 Units DECA 10 Units DECI 0.1 Unit CENTI 0.01 Unit MILLI 0.001 Unit Meters Liters Grams Lateral Chart How do you use the “ladder” method? 1 st – Determine your starting point. 2 nd – Count the “jumps” to your ending point. 3 rd – Move the decimal the same number of jumps in the same direction. 4 km = _________ m 1 2 3 How many jumps does it take? Starting Point Ending Point 4. 1 __. 2 3 = 4000 m

What is the order of the metric system? King Henry Died by Drinking Chocolate Milk –King: Kilok –Henry: Hectoh –Died: Decada –By: Base units > meter, liter, gram (m, L, g) –Drinking: Decid –Chocolate: Centic –Milk: Millim