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SI Units and Standards of Measurement Mr. Haase

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Standards of Measurement Standard – Exact quantity used to compare measurements – U.S. uses English & metric standards – Most other nations... all metric system English Vs. Metric System – Yards vs. Meters – Gallons vs. Liters – Pounds vs. Grams – Miles vs. Kilometers – Fahrenheit vs. Celsius

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Metric System SI System – System International or Metric System – Accepted by scientist throughout the world – Uses a base unit with prefixes – Based on units of 10

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Metric System Base Units Base Units – Meter – Liters – Gram – Second – Celsius/Kelvin measures temp

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Metric Prefixes – Use prefixes with base units – Kilo = 1000 – Hecto = 100 – Deca = 10 – Base Units (g, L & m) = 1 – Deci = 1/10 or 0.1 – Centi = 1/100 or 0.01 – Milli = 1/1000 or 0.001

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Metric Prefixes

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Length – Distance between two points – Metric base unit is the meter

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Volume – Amount of space occupied by an object – Metric base unit is Liter – Volume of a solid is measured with unit of length Length x Width X Height L(1) x L(2) x L(3) cm³

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Volume Volume of a liquid – Use graduated cylinders for precise volume Volume of a solid – Use ruler or meter stick to measure 3 dimensions

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Mass – Amount of matter in an object – Metric base unit is the gram

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Density – The mass per unit volume of an object – Density equals mass of an object divided by the volume – D = m/v – Unit for density is g/cm³ OR g/mL – Density < 1 object floats – Density > 1 object sinks

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Time and Temperature Time – Interval between two events – Unit of measurement is seconds Temperature – How hot or cold something is – Unit of measurement is °Celsius or °Kelvin

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Temperature Conversions Temp Conversions – Water boils at 100° C and 212° F – Water freezes at 0° C and 32°F C = (F – 32) x.56 F = (C x 1.8) + 32

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Example Problems 1.Find the volume of a box that has a length of 2.3 mm, height of 3.4 mm and a width of 2.1 mm. 2. Find the width of a container that has a volume of 120 cm³, length of 10 cm and height of 5 cm. 3. Find the density of an object that has a mass of 2.1 mg and volume of 9.2 mm³. 4. Find the mass of an object that has a density of 0.78 g/ml and a volume of 16 ml.

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Example Problems 1. Convert the following: 45° C to F 97° F to C 12°F to C 65° C to F

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