Mr. O’Rourke Technology Education

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Mr. O’Rourke Technology Education Measurement Mr. O’Rourke Technology Education

History of Measurement Ancient Egypt Measured with fingers, palms, arms, etc.

US Standard Units Focusing on Length Also known as Inches Feet Yards Miles Also known as English Units US Customary Units

Measuring Length (standard”) Dial Calipers Measure inches down to .001” Ruler Measure inches (usually 12”) Each inch broke into 16ths Yard Stick 36”=3’ Tape Measure Measure feet and inches (25’+)

Metric System Based on the Meter and the number 10 Name The Number Prefix Symbol trillion 1,000,000,000,000tera T billion 1,000,000,000 giga G million 1,000,000 mega M thousand 1,000 kilo k hundred 100 hecto h ten 10 deka da unit 1 tenth 0.1 deci d hundredth 0.01 centi c thousandth 0.001 milli m 1 meter=39.38” millionth 0.000 001 micro µ billionth 0.000 000 001 nano n trillionth 0.000 000 000 001 pico p