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Measurement

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**Measurement Measurements have 2 parts: Example: 5cm**

A number A unit Example: 5cm Scientists (and we will) use the SI system Système International d’unités

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The SI units = METRIC There are only 3 countries in the whole world using the ENGLISH SYSTEM of measurement Liberia Myanmar (formerly Burma) THE UNITED STATES of AMERICA Why is the metric system so much easier? Most countries use it It is based on powers of 10

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**Units There is always a BASE unit for every measurement**

There can be prefixes added to the base to make it larger or smaller Example: millisecond, kilogram

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**Base Units Length = meter (m) Mass = gram (g)**

Volume = liter (L) or cubic centimeters (cm3) Time = second (s) ** Prefixes multiply the BASE unit by a value of 10 **

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**PREFIX Symbol multiplier**

Kilo k 1,000 hecto h 100 deka da 10 base: 1 deci d 0.1 centi c milli m

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**King Henry Died Unfortunately Drinking Chocolate Milk**

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Unit Conversions The metric system is so useful because we can convert from one unit to another EASILY Write out the abbreviations in a horizontal row: K H D U D C M Find the location of the original unit, then count the number of jumps and direction to the new unit Re-write the number, then hold the pencil on the decimal point. Move your pencil, making “egg crates”, the number of jumps in the correct direction- then fill in the empy crates with ZEROS Re-write your final answer, including number and unit

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Let’s try some! Convert: 12 gram to kilograms hL to cL 5.22 seconds to milliseconds dm to cm How many centiliters are in 1 kiloliter?

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**Length Length = distance from one point to another**

Length is measured with a METRIC RULER The BASE unit = meter Examples: centimeter (cm), millimeter (mm), decimeter (dm)

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**Mass Mass= the amount of matter in an object**

Mass is measured with a balance The BASE unit = gram Examples: kilogram (kg), milligram (mg)

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**Volume= the amount of space something takes up**

Solid Measurement Liquid Measurement The BASE unit = cm3 Use a formula to calculate for regular shapes For irregular shapes use Water Displacement Method The BASE unit = Liter Use a GRADUATED CYLINDER to measure

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**Volume Direct Measurement Indirect Measurement**

Use a ruler to measure and plug into formula Example: Volume of a cube = length x width x height Water displacement method Fill a graduated cylinder with water- record volume Carefully add object- record new volume of water Subtract old volume from new volume = volume of object

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**In order for a measurement to be reliable…**

It needs to be both ACCURATE and PRECISE Accuracy = EXACT Precision = multiple measurements close to each other

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**Scientific Notation Makes using large numbers easier**

Write a number times a power of 10 Example: 3.0 x 108 = 300,000,000 Number must be between 1 and 10 Always there The NUMBER of places and DIRECTION the decimal is moved

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Scientific Notation #’s less than 1 ( ) have a NEGATIVE exponent #’s greater than 1 have a POSITIVE exponent

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Try Some: Expand: 4.2 x 104 3.359 x 10 -6 x 108

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Try Some More… Write in scientific notation: 870 0.245 75000

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