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Metric System
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What is the Metric System
Developed by the French in the late 1700’s.
Used by almost every country in the world, with the exception of the USA.
Especially used by scientists.
Based on units of ten
1 x 10 = 10
10 x 10 = 100
10 x 100 = 1000
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What’s Wrong with the English System?
It’s based on random numbers
that are weird and confusing!
Feet… was the length of some guy’s foot
Inch… length of some other guy’s
thumb
A gallon in England is different from the gallon in America… Confusing????
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Metric Prefixes
No matter what you are measuring we use the same prefixes:
Kilo – Hecto- Deca – UNIT – deci – centi – milli
1000 – 100 - 10 1/10 – 1/100 – 1/1000
(King) (Henry) (Died) (drinking) (chocolate) (milk)
1 meter = 100 centimeters = 1000 millimeters
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Length Definition: The distance between
two points.
INSTRUMENT: Metric Ruler
Meter Stick
UNIT: Meter (m)
Centimeter (cm) Millimeter (mm)
How long is the line? How tall is the tree? How far did they run?
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Reading a Metric Ruler
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Definition: The amount of
matter in an object
INSTRUMENT: Triple Beam Balance
UNIT: Gram (g) Kilogram (kg) Milligram (mg)
Mass
How big is the elephant?
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.
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Reading a Triple Beam Balance
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Liquid Volume
Definition: The amount of
space occupied by a liquid substance.
INSTRUMENT: Graduated cylinder
UNIT: Milliliter (mL) Liter (L)
How much soda is in the glass? How much milk does the recipe say
goes in the pancake batter?
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Liquid Volume
When reading liquid volume you must always read from the bottom of the MENISCUS
Meniscus – curve
in liquid caused by the force of gravity
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