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SI Units

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

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**What is the importance and purpose of the SI system?**

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

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**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.

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**SI prefixes: Prefix Multiplier 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- 0.001 micro- nano

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**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?

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**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 m3 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 cm3

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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.

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**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.

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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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**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)

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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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