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SI Units. Standard  S8CS2a. Follow correct procedures for use of scientific apparatus.  S8CS4b. Use appropriate tools and units for measuring objects.

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Presentation on theme: "SI Units. Standard  S8CS2a. Follow correct procedures for use of scientific apparatus.  S8CS4b. Use appropriate tools and units for measuring objects."— Presentation transcript:

1 SI Units

2 Standard  S8CS2a. Follow correct procedures for use of scientific apparatus.  S8CS4b. Use appropriate tools and units for measuring objects and/or substances.

3 Essential Question  What is the importance and purpose of the SI system?

4  https://www.youtube.com/watch?v=U04nHNUMfPA https://www.youtube.com/watch?v=U04nHNUMfPA  https://www.youtube.com/watch?v=KfrCaKyhwZk https://www.youtube.com/watch?v=KfrCaKyhwZk

5 The International System  The International System of Units, or SI for short, was designed to provide a worldwide standard of physical measurement for science, industry, and commerce.

6 SI prefixes: PrefixMultiplier giga-1,000,000,000 mega-1,000,000 kilo-1,000 hecto-100 deka-10 [unit]1 deci-0.1 centi-0.01 milli micro nano

7 Length  Length is defined as the distance between two points.  The meter is the SI unit of measure for length  One meter is about the size of a baseball bat  The size of rooms or buildings is often measured with a meter, smaller objects such as a book or pencil is measured with either centimeter or millimeter.  Long distances may be measured with kilometers  How many kilometers is a marathon?

8 Volume  Volume is the amount of space an object occupies.  Volume describes the amount of space inside a 3D object, therefore the unit is cubed  The cubic meter m 3 is the SI unit for volume  To measure the volume of a square or rectangle, measure the length, width, and height and multiply them together.  A liter is a measurement of liquid volume (a 2-liter of soda)  1L=1000 cm 3

9 Mass  The mass of an object measures the amount of matter in the object.  This is different from weight***  Kilogram is the SI unit for mass  You can determine mass with a triple beam balance.

10 Weight  Weight is a measurement of force.  The SI unit for weight is newton (N)  What force determines our weight?? Hint- if you travel to other planets you would weight different amounts depending on the amount of this force present.

11 Temperature  The physical property of temperature is related to how hot or cold an object is. Temperature is a measure of the kinetic energy, or energy of motion, of the particles that make up matter.  Temperature is measures in SI Units with the kelvin (K) scale  Farenhiet and Celsius temperature scales are the most commonly used scales. These scales DO NOT start at zero (hence both having negative numbers) Kelvin starts at ABSOLUTE ZERO

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13 Time and Rates  Time is the interval between two events  The SI unit for time is seconds (s), time is also measured in hours (h)  A rate is the amount of change of one measurement in a given amount of time  Speed is a common type of rate measured (kilometers per hour km/h)

14 DISCLAIMER  Several units we use everyday are NOT used throughout the rest of the world, and are NEVER used in science.  For example: miles, pounds, inches


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