SI Measurement System © 2012 Project Lead The Way, Inc.Introduction to Engineering Design.
SI Measurement
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Transcript of SI Measurement
SI Measurement
• Le System international d’Unites
• Internationally agreed – 75 000 not 75, 000– Meters not miles– Liters not gallons
Units?
• mass
• length
• Volume
• Time
• Amount of a substance
Other Units
• Derived unit – combination of units like in velocity m/s2, or pressure kg/m s2
• Density – g/cm
Density
• D = m/v
• Ratio of mass to volume
• The mass divided by the volume
• Physical property
Mass
• kilogram is the standard– 1000 grams
• We use grams – more useful in science class.• King Henry Chart
– Remember
• Mass measure of matter, does not depend on gravity
• Weight – measure of the gravitational pull on the mass
Mass and weight
• mass is the amount of matter and will not change with location
• Weight is a measure of gravity and will change with location
How to convert
• King Henry chart – memorize
• King Henry drank uho delicious chocolate milk
• Kilo Hecto daka ______deci centi milli
Larger prefixes
• Mega
• Giga
• tera
Smaller prefixes
• Micro
• Nano
• Pico
• Femto
• atto
Multiple conversions
• Affects density, area etc
• If the unit is squared, you need to convert twice.
• If the unit is cubed you need to convert _______________
Practice
• Pg 60. #31-34