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Warm Up On page 11 of your science notebook: On page 11 of your science notebook: Do the following for each of the four items at your desk: Do the following for each of the four items at your desk: 1. Draw a picture of the item 2. Write what you think the item is called 3. Write what you think the item is used to measure

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Making Measurements

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International System of Measurements Used by scientists around the world Used by scientists around the world Also known as the metric system Also known as the metric system Based on multiples of ten – makes it easy to convert between units Based on multiples of ten – makes it easy to convert between units

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Common Prefixes PrefixSymbolMeaning Kilo-k1,000 Hecto-h 100 Deka-da 10 Deci-d 0.1 (one tenth) Centi-c 0.01 (one hundredth) Milli-m 0.001 (one thousandth)

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Length The distance between two points The distance between two points SI unit is the METER SI unit is the METER Tools used include a meter stick or ruler Tools used include a meter stick or ruler Light-year Light-year Unit used for long distances in outer space Unit used for long distances in outer space It is the distance light travels in a year It is the distance light travels in a year A measurement of distance NOT time A measurement of distance NOT time

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Volume The amount of space something takes up The amount of space something takes up SI unit is the LITER for liquids and is measured with a graduated cylinder SI unit is the LITER for liquids and is measured with a graduated cylinder Volume of regular objects can be measured by length x width x height and unit is cm 3 Volume of regular objects can be measured by length x width x height and unit is cm 3

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Mass The amount of matter in object The amount of matter in object SI unit is the GRAM SI unit is the GRAM Tools used include a triple beam balance Tools used include a triple beam balance

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Density The mass per unit of volume; mass divided by volume The mass per unit of volume; mass divided by volume Expressed in g/cm 3 for solids and g/mL for liquids and gases Expressed in g/cm 3 for solids and g/mL for liquids and gases

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Temperature SI uses the Celsius scale – measured in degrees Celsius SI uses the Celsius scale – measured in degrees Celsius Tool used is the thermometer Tool used is the thermometer Water freezes at 0 degrees Celsius and boils at 100 degrees Celsius Water freezes at 0 degrees Celsius and boils at 100 degrees Celsius Fahrenheit can be converted to Celsius Fahrenheit can be converted to Celsius C=(F-32) * 5/9 C=(F-32) * 5/9

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Time Measured in seconds (and minutes, hours, years, etc.) Measured in seconds (and minutes, hours, years, etc.)

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