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Unit 1 Using SI Units

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Measurement Standard An exact quantity that people agree to use for comparison. * helps you get the same answer as other people

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**What was used as the earliest measurement standards?**

Body Parts * The question then, is WHO’S body parts? The KING’S or QUEEN’S

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**Is your hand or a body part a good standard of measurement?**

* no * people’s hands are not the same size * get different answers

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**In order for any measurement to MAKE SENSE; two things must be included.**

1.) a number 2.) a unit

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**Every type of measurement has a base or central unit.**

* meter (distance or length) * liter (volume) * gram (mass) * second (time)

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**Adding a prefix to a base (central) unit, you can create a whole new unit to measure any object.**

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**Prefixes Used When Measuring:**

Large Objects kilo = 103 hecto = 102 deka = 101 Small Objects deci = 10-1 centi = 10-2 milli = 10-3

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**Measurements that can be made**

Length Mass Temperature Time Area Volume Density Weight

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**Length The distance between two points. Base (central) units of length**

* (US) FOOT [ft] * (SI) METER [m]

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Length Length of an object or the distance between two points is measured using a METERSTICK.

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**Mass “A body of coherent matter.”**

* a collection of stuff joined to form an object Base (central) units of mass * (US) SLUG [slug] * (SI) KILOGRAM [kg] sometimes gram [g]

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Mass Mass is measured using a BALANCE.

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**Measurement of how hot or cold something is.**

Temperature Measurement of how hot or cold something is.

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**Temperature Base (central) units of temperature * (US) FAHRENHEIT [oF]**

* (SI) CELCIUS [oC] > (SI) KELVIN [K] * this is an absolute scale

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Temperature Temperature is measured using a THERMOMETER.

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**Absolute Zero The coldest possible temperature.**

* temperature where ALL motion stops * 0 Kelvin * found by the formula: K = oC

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**Time Interval between two events. Base (central) units of time**

* (US) SECOND [s] * (SI) SECOND [s]

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Time Time can be measured using a CLOCK or a CALENDAR.

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Derived Units Obtained by combining multiple units of measurement.

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**Area The amount of surface included in a set of boundaries.**

Found by the formula: * Area = length x width

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Area What is the difference between length and width? DIRECTION

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**Area Base units of area * (US) FEET SQUARED [ft2]**

* (SI) METERS SQUARED[m2]

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**Volume The amount of space an object occupies.**

Easy with liquids & gases, harder with solids * for a solid you may need the formula: volume = l x w x h

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Volume For a liquid or a gas all you need is a devise that is designed to measure volume. * a beaker, a flask or a graduated cylinder

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**Volume Base (central) units of volume * (US) GALLON [gal]**

* (SI) LITER [L] sometimes centimeters cubed [cm3]

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Volume 1 milliliter equals 1 centimeter cubed. * 1 mL = 1 cm3

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**Density The measurement of how thick, compact and solid an object is.**

Relationship between the mass & volume of an object

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**Density Found by the formula: * Density = mass ÷ volume**

Expressed in g/L or g/cm3 * a mass unit / a volume unit

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Weight Measurement of the force of gravity pulling on the mass of an object. Changes as gravity changes. Base units of weight * (US) POUND [lb] * (SI) NEWTON [N]

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Weight Weight is measured using a SPRING SCALE.

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**MASS and WEIGHT are NOT the same thing!**

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**(changing a physical property does NOT change the substance)**

Physical Properties Characteristics of a substance that can be used to identify it. Color Shape Texture State of matter Size All measurements (changing a physical property does NOT change the substance)

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The End

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