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Standards of Measurement
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Units and Standards A standard is an exact quantity that people agree to use for comparison If different measurements are made using the same standard we can compare them
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Le Systeme Internationale d’Unites
The International System of Units was developed in 1960 We now call this the SI system for short SI is a set of standards that are universally accepted and used by scientists around the world
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Measurement Systems What is the purpose of a standard?
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Measurement Systems The SI system is based on multiples of 10
Prefixes are used to show which multiple of 10 is being used Prefix Symbol Multiplying Factor Kilo- k 1,000 Deci- d 0.1 Centi- c 0.01 Milli- m 0.001 Micro- Nano- n
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What will we be measuring?
Length Volume Density Time Temperature
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Length We use length to measure size and distance
Meter, centimeter, kilometer
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Volume Volume is the amount of space occupied by an object 1ml = 1cm3
Liters, milliliters
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Matter Matter is anything that takes up space
Mass is a measurement of the quantity of matter in an object Grams, kilograms
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Density Density is the mass per unit of volume of an object g/cm3
How much matter is in a given space g/cm3
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Time The SI unit for time is the Second (s) 60 s = 1 min
3,600 s = 60 min = 1 hr
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Temperature The SI unit for temperature is the kelvin (K)
Zero on the kelvin scale (0 K) is the coldest possible temperature – absolute zero 0 K = -273 ºC 273 ºC below the freezing point of water!!! COLD!
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Freezing point of Water
Temperature The kelvin scale is based on absolute zero (-273 ºC) Kelvin Celsius Fahrenheit Freezing point of Water 273 K 0 ºC 32 ºF Boiling point of Water 373 K 100 ºC 212 ºF
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Converting SI units How do we convert between units?
You have a length of rope that measures 3,075mm. How long is it in centimeters? Your drive to school is 12.4km. How far is it in meters?
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(Write neatly!! This one can be tricky if you lose your place!)
Converting SI units The speed limit on the Northway is 65mph. Convert 65mph to km/h. 1 mile = 1.61km Once you have calculated km/h, convert your answer to m/s. (Write neatly!! This one can be tricky if you lose your place!)
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