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The Metric System

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**Getting to Know Metrics – Unit 1**

There are only 3 civilized countries that do NOT use the metric system. Myanmar (Burma) US Liberia

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**Metric Units 10.. Some metric units include: The Metric System is**

grams liters meters The Metric System is based on units of 10..

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**Traveling in Canada or Mexico**

When have you used the Metric System? Swimming pool Track and Field Traveling in Canada or Mexico

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**Any exact quantity that people agree to use for comparison is a standard.**

Hundreds of years ago, different countries used different systems of measurement.

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Most scientists in almost all countries use the International System of Units, also known as SI. This is the metric system.

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**The base units of SI: Meter – measures length or distance**

Gram – measures mass Liter or cubic centimeter – measures volume Degrees Kelvin – measures temperature

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**Science labs use the Metric temperature scale Celsius.**

ROOM TEMPERATURE 20° C ----

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**Fahrenheit Scale Water freezes 32°F Room temperature 70°F**

Body temperature °F Water boils °F 293 °K 20 ° C 70 ° F

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**To find the Kelvin temperature, add 273 to the Celcius temperature.**

Kelvin Scale To find the Kelvin temperature, add 273 to the Celcius temperature. Water freezes °K Room temperature °K Body temperature °K Water boils °K

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**Metric Volume The amount of space an object takes up is the volume.**

The metric units of volume are milliliter and liter. Milliliters can also be expressed as cubic centimeters (cm³).

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**A liter is a little more than a quart.**

A few drops of water would be a milliliter.

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**One liter contains 1000 milliliters or 1000 cm³.**

For water: 1 milliliter = 1 centimeter cubed = 1 gram OR 1 mL = 1 cm³ = 1 g

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3 Ways to Measure Volume Graduated Cylinder – pour liquid in and read scale Math Formula – measure with ruler and use math formula V = l x w x h Displacement – measure water in container, add the solid and re-measure water level, subtract first measure from the second measure.

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**Metric Length The distance between two points.**

Measured with a ruler or meterstick. A meter is slightly longer than a yard.

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**A meter is the distance from the floor to a doorknob or the length of a baseball bat.**

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**0.01 (one-hundredth) of a meter is a centimeter (cm).**

A centimeter is about the diameter of a shirt button or the diameter of the colored part of the eye. Also the width of the pinky finger.

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**To measure very small items, use the millimeter.**

It is the thickness of a dime. Another example is the tip of a pencil lead.

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**When we measure very long distances, we use the kilometer.**

The tallest building in the world is less than ½ of a kilometer. The kilometer is used to measure distance between cities.

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10 mm = 1 cm 100 cm = 1 m 1000 m = 1 km

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**Metric Mass The amount of matter in an object.**

Mass is measured with a balance.

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**A grain of sand and pills are measured in milligrams.**

A milligram (mg) is very light. A grain of sand and pills are measured in milligrams. 1000 mg = 1 gram

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**A paper clip and a dollar bill have a mass of one gram.**

A gram is heavier than the milligram. A paper clip and a dollar bill have a mass of one gram.

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**A nickel has a mass of about 5 grams.**

A kilogram is much heavier than a gram. 1000 g = 1 kg

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**A science book has a mass of about one kilogram.**

A pair of shoes (not really big ones) has a mass of about one kilogram.

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**Used in science labs and measured in degrees Celcius or °C**

Metric Temperatures Used in science labs and measured in degrees Celcius or °C Water freezes at 0 °C Water boils at 100 °C Normal body temperature is 37 °C Room temperature is about 20 °C

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