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Measurement

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**Measurement Metric units**

The fundamental units : length is the meter (m) Mass is the gram (g) Volume is the liter (l) Temperature is degree Kelvin (°K) but Celsius (°C) is more commonly used

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**Measurement Metric units**

The metric system is based on the number 10 and therefore a decimal system Prefixes precede the root or main word (gram, liter, meter). The following prefixes are commonly used in science:

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**Measurement Metric units**

Examples: A millimeter is about how thick as a toenail. A centimeter is about as thick as a dime. A kilometer is a little more than half of a mile.

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**Measurement Conversions**

The base represents gram, liter and meter. ● ● ●------● ● ● ● ● ● ● ● ● ● *--- Prefix: Mega Kilo Hecto Deca Basic Unit Deci Centi Milli Micro Abbrev: M k h dc m, l, g d c m mc or μ

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**Measurement Conversions**

Moving to the RIGHT increase Moving to the LEFT decrease

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**Measurement Conversions**

Hint – we are referring to the exponent associated with 10 when we “count” places to move the decimal We are NOT counting actual words listed on the chart

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For example if you have 80 hl and you want to convert to cl then you must move 4 spaces to the right. So you move your decimal point 4 spaces to the right. Your answer is cl

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For example if you have 5mg and you want to convert to g then you must move 3 spaces to the left. So you move your decimal point 3 spaces to the left. Your answer is 0.005g

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**Measurement Length The basic metric unit of length is the meter (m).**

DIFFERENCES BETWEEN: English units Metric units

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Measurement Length

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**Volume When a figure has three dimensions**

(length, width, and height) we can find its volume. In the metric system volume can be expressed in terms of liters or cubic centimeters (cm3 or cc)

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**Volume The meniscus is the curved interface between the water and air.**

This is due to the surface tension and adhesive forces of water as it interacts with its container. A: The bottom of a concave meniscus. B: The top of a convex meniscus.

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**Volume In a laboratory you would work with**

pipettes: pipette pump or filling device is used to draw and dispense fluids

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**Volume In a laboratory you would work with Graduated cylinders**

Erlenmeyer flasks Beakers

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Mass Mass is a measurement of the amount of matter in an object. It is determined by the molecular structure of the object. Not to be confused with…………..

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Mass Weight is a measure of the gravitational pull on an object. It is not the same as mass.

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**Mass In a laboratory you would work with**

Triple beam balance / Electronic scale

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Scientific Notation Scientific notation uses powers of 10 so very large or small numbers can be expressed concisely.

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Scientific Notation The number we use as the base for this system is 10. The exponent is the power of the number and is applied to the base.

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For example Write the following large number using Scientific Notation : 146,000,000,000. Step 1 :place the decimal after the first digit and drop all the zeros. ,000,000_ Step 2: count the number of places from the decimal to the end of the number. There are 11 places after the decimal point; therefore the exponent is 11. 1.46 X 1011

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For example Step 1: with small numbers you count from the decimal the number of zeroes until you reach the first non-zero number = 1.23 X10-6

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Graphing Data Line graphs have both X axis and Y axis. Each X and Y axis is subdivided into uniform intervals.

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