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Drill: Write down these questions and have 2 answers per questions. Be as specific with your answers as possible.

Questions that we deal with1. Why do we measure?2. What do we measure?3. How do we measure?4. When do we measure?5. Where do we measure?6. Who measures?

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METROLOGY is the science of measurement, based on the Greek word ‘metron’.

METROLOGY should not be confused with meteorology.

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INTRODUCTION TO METROLOGY

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Measuring instruments

• Ruler• Thermometer• Barometer• Clock• Scale• Voltmeter• GPS• Hydrometer• Viscometer

• Graduated Cylinder• Radar Gun• Speedometer• Tachometer• Accelerometer• Spectrometer• Protractor• Compass• Sphygmomanometer

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7 FUNDAMENTAL SI UNITS:

1. LENGTH - meter

2. MASS - kilogram

3. TIME - second

4. ELECTRIC CURRENT - ampere

5. THERMODYNAMIC TEMPERATURE - Kelvin

6. AMOUNT OF MATTER - mole

7. LUMINOUS INTENSITY - candela

Base Units

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LENGTH

English System

1 foot =12 inches

1 yard = 3 feet

1 mile = 5280 feet

Metric System

1 m = 100 cm

1 m = 1000 mm

1 km = 1000 m

1 in = 2.54 cm

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MASSEnglish System

1 lb = 16 ounces

1 ton = 2000 lbs

Metric System

1 kg = 1000 g

1 g = 1000 mg

1 lb = 2.2 kg

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Time

1 minute = 60 seconds

1 hour = 60 minutes

1 day = 24 hours

1 year = 365 days

Metric System Prefixes

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Prefix Symbol Scientific Notation

Tera T 1012

Giga G 109

Mega M 106

Kilo k 103

Centi c 10-2

Milli m 10-3

Micro 10-6

Nano n 10-9

Pico p 10-12

Femto f 10-15

Metric System

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WHAT IS THE DEFINITION OF …

A.MICROSECOND

B.TERABYTE

C. CENTIMETER

D. KILOJOULE

10-6 Seconds

1012 Bytes

10-2 Meters

103 Joules

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Derived Units

A car travels 30 miles in 30 minutes. What is the speed of the car in miles/hr?

Time

DistSpeed

min30

30milesSpeed

hour

milesSpeed

5.0

30

mphSpeed 60

New unit of measure of speed based on Length/Time

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Derived Units

What is the volume of a 3ft x 2ft x 6ft block of wood?

HeightWidthLengthVolume

ftftftVolume 623 336 ftVolume

Derived measurement of volume based on ft3