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The Metric System

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Way Back When . . . When people first started to measure things, the systems were different in different parts of the world. Many systems were based on parts of the body. Foot Inch

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**History of Metric System**

Developed by the French in the late 1700’s. Based on powers of ten.

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**History of Metric System**

Developed by the French in the late 1700’s. Based on powers of ten. Used by almost every country in the world, with the notable exception of the USA. Especially used by scientists. Abbreviated SI, which is French for Systeme International.

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Why the Metric System? NASA still works in imperial units and has had difficulty when needing to work with other groups that use metric In 1999 the Mars Climate Orbiter was lost because the altitude control system used imperial units (English Standard) and the navigation software used metric.

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Metric System Units can be scaled by factors of 10 depending on what you are measuring So it can be used for small measurements as well as large Kilo- Hecto- Deca- Base- Deci- Centi- Milli-

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Measurements Mass Weight Length Volume Density

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Mass Mass is the amount of matter that makes up an object.

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**Mass Mass is the amount of matter that makes up an object.**

A golf ball and a ping pong ball are the same size, but the golf ball has a lot more matter in it. So the golf ball will have more mass. The mass of an object will not change unless we add or subtract matter from it.

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**Mass Unit used: Gram (g) Tool Used: Balance**

A paper clip has the mass of about 1 gram.

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**Weight Weight is a measure of the force of gravity on an object.**

Your weight can change depending on the force of gravity. The gravity will change depending on the planet you are on. The unit for weight is the Newton (N).

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Weight Weight is a measure of the force of gravity on an object.

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**Weight and Mass Earth 1 gravity Moon 1/6th gravity Jupiter**

2.5 gravities mass 30kg weight 300N 50N 750N Jill’s mass remains the same on earth and the moon, but her weight changes due to different gravitational forces.

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**Length Length is the distance between two points. Unit used: Meter (m)**

Tool Used: Ruler or meter stick

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

Unit used: Liter (l) Tool Used: graduated cylinder

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

Unit used: Liter (l) Tool Used: graduated cylinder Liquids form a meniscus (curved, upper surface) To correctly read the volume, read the bottom of the curve.

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**Volume V = Length x Width x Height**

We can find the volume of box shapes by the formula: V = Length x Width x Height We can use water displacement to find the volume of irregular shaped objects

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Volume Ex: We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the rock has a volume of 2 ml. 1cm3 water =1 ml of water = 1 gram

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Density Density is the amount of matter (mass) compared to the amount of space (volume) the object occupies. Unit for density is g/ml

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Density Density is the amount of matter (mass) compared to the amount of space (volume) the object occupies. Unit for density is g/ml Equation:

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**Temperature Unit used: Celsius (C) Tool Used: Thermometer**

0o Celsius= freezing 100o Celsius= boiling 32o F= freezing point 212o F= boiling point

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**Metric System Base unit Meter (m) Liter (L) Gram (g) 1 Prefix**

Abbreviation Power of 10 Kilo k 1000 Hecto h 100 Deka da 10 Base unit Meter (m) Liter (L) Gram (g) 1 Deci d 0.1 Centi c 0.01 Milli m 0.001

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**Conversions King Henry Died By Drinking Chocolate Milk**

If moving to the right, move the decimal to the right that many steps. If moving the left, move the decimal to the left that many steps.

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Practice Problems Convert 15 grams (g) to kilograms (kg)

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Practice Problems Convert 115 millimeters (cm) to decimeters (mm).

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