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SI Units

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Why is it important to have STANDARDS? Let’s say you go in the local Footlocker with some cash, tell the salesman that you want these in a size 10.

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So.. The salesman brings you back these instead… in size 10, of course. What happened?

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Standards It is important to have a set STANDARD for measurements, so that no matter where or what you are measuring, the measurement MEANS the same thing. It is important to have a set STANDARD for measurements, so that no matter where or what you are measuring, the measurement MEANS the same thing. In 1960, international scientists agreed to standards of measurements for use in the scientific community – System International d’Unites – also known as, SI Units In 1960, international scientists agreed to standards of measurements for use in the scientific community – System International d’Unites – also known as, SI Units

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SI Base Units Quantity - TIME Symbol in equations- t Unit- second Abbreviation- s

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SI Base Units Quantity- Length Quantity- Length Symbol in Equations- l or d Symbol in Equations- l or d Units- meters Units- meters Abbreviation- m Abbreviation- m

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SI Base Units Quantity- mass Quantity- mass Symbol in equations- m Symbol in equations- m Unit- kilogram Unit- kilogram Abbreviation- kg Abbreviation- kg

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SI Base Units Quantity- Temperature Quantity- Temperature Symbol in equations- T Symbol in equations- T Unit- kelvins Unit- kelvins Abbreviation- K Abbreviation- K Apia 29° 24° Bangkok 31° 27° Brisbane 20° 11° Buenos Aires 15° 4° Cairo 37° 27° Dubai 38° 31° Johannesburg 26° 11° Los Angeles 21° 15° Melbourne 18° 7° Nadi 29° 22° New Delhi 34° 28° New York 32° 22° Nuku'alofa 28° 18° Rarotonga 29° 19° Rome 29° 18° Scott Base -28° -32° Shanghai 29° 26° Singapore 29° 25° Sydney 17° 12° Tokyo 34° 28° Vladivostok -68° -75°

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Celsius Fahrenheit ºF = 1.8(ºC) + 32 For example, the weather report in Cairo today states that it is 30ºC. What type of clothing should I wear? ºF = 1.8(30ºC) + 32 ºF = 54 + 32 ºF = 86ºF

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What about ºC ºF Same equation ºF = 1.8(ºC) + 32, rearranged. ºC = (ºF – 32)/1.8 While staying in Amsterdam, you decide to cook afternoon tea for your flat mates. You need to convert your US recipe from 420º Fahrenheit to Celsius.

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What about Kelvin, the SI Unit? Once you know Celsius, Kelvin is EASY! Once you know Celsius, Kelvin is EASY! ºK = ºC + 273 OR ºC = ºK - 273

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SI Base Units Quantity- mole Quantity- mole Symbol in equations- n Symbol in equations- n Unit- mole Unit- mole Abbreviation- mol Abbreviation- mol

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Practice What is the temperature in Farenheit and Kelvin at 0°C?

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Prefixes King King Henry Henry Died Died Monday Monday Drinking Drinking Chocolate Chocolate Milk Milk Kilo- Hecto- Deka- Deci- Centi- Milli-

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NEED TO KNOW If I need to convert from meters to centimeters, this requires a two step movement of my decimal point. KHDMDCM 0.0123 m = _1.23__ cm

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Practice Conversions 23.2 km to m 23.2 km to m 65.001 cm to m 65.001 cm to m 10000.2 mg to dag 10000.2 mg to dag 123456789 dg to μg 123456789 dg to μg

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Homework 1.-273 ______________ 2._____ _______212°F 3._____ 450 K_______ 4._____ _______98.6°F 5._____ 294 K_______ 6._____ _______77°F 7._____ 225 K_______ 8.-40°C ______________ Fill in the chart below. °CK°F

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Homework 1.-273 ______________ 2._____ _______212°F 3._____ 450 K_______ 4._____ _______98.6°F 5._____ 294 K_______ 6._____ _______77°F 7._____ 225 K_______ 8.-40°C ______________ Fill in the chart below. °CK°F

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Homework 1.-273 ______________ 2._____ _______212°F 3._____ 450 K_______ 4._____ _______98.6°F 5._____ 294 K_______ 6._____ _______77°F 7._____ 225 K_______ 8.-40°C ______________ Fill in the chart below. °CK°F

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Homework 1.-273 ______________ 2._____ _______212°F 3._____ 450 K_______ 4._____ _______98.6°F 5._____ 294 K_______ 6._____ _______77°F 7._____ 225 K_______ 8.-40°C ______________ Fill in the chart below. °CK°F

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Homework 1.-273 ______________ 2._____ _______212°F 3._____ 450 K_______ 4._____ _______98.6°F 5._____ 294 K_______ 6._____ _______77°F 7._____ 225 K_______ 8.-40°C ______________ Fill in the chart below. °CK°F

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Homework 1.-273 ______________ 2._____ _______212°F 3._____ 450 K_______ 4._____ _______98.6°F 5._____ 294 K_______ 6._____ _______77°F 7._____ 225 K_______ 8.-40°C ______________ Fill in the chart below. °CK°F

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