Conversions The universally accepted system of measurement is the SI System, the System Internationale d’Unites, or the International System, also known as the metric system. The metric system is based on the unit ________. http://www.teamtechnology.co.uk/balance.jpg

Base Units of Measurement Symbol Length/Distance meter m Mass gram g Temperature Kelvin K Volume liter L Time second s Energy Joule J Speed meter per second m/s Frequency 1/second Hz Density grams/milliliter g/mL Pressure Pascal Pa

Practice!! Number Measurement 0.00965 kg mass 940500 Mm 409000000 ps 0.0003400 J 780000. Pa 5.600 g/mL 0.000450 mL 9203000000 kJ 0.0300 mg 600 K 0.01 km

How the Base Unit Works 103 100 10-2 10-3 10-6 1000 1 0.01 0.001 0.000001 Kilo Base Unit (m, l, g, etc) Centi Milli Micro

SI Prefixes Prefix Symbol Meaning Mega M 106 Kilo k 103 Base -- 100 centi c 10-2 milli m 10-3 micro 10-6 nano n 10-9 pico p 10-12

SI Unit Conversions Convert 3450 cm to km. 3450 cm 1 km = 3450 x 10-5 km or 3.45 x 10-2 km 105 cm Convert 0.0036 g to mg. 0.0036 g 106 mg = 0.0036 x 106 mg or 3.6 x 103 mg 1 g Convert 8.9 x 10-8 s to ps. 8.9 x 10-8 s 1012 ps = 8.9 x 104 ps 1 s

Practice with Conversion Convert the following: 23.2 m = ______ cm 93.71m = ______ km 920,000 µm = _________m 3.6 x 10-11 ML = _________ L 1.41 x 1014 pg = ________g 16.0 ns = ________ s

Practice with Dimensional Analysis In Raiders of the Lost Ark, Indiana Jones tried to remove a gold idol from a booby-trapped pedestal. He replaces the idol with a bag of sand. If the idol has a mass of 2.00 kg, how many litres of sand must he place on the pedestal to keep the mass sensitive booby-trap from activating? (Density of sand is 3.00 g/cm3)

Practice with Dimensional Analysis At a given point in its orbit, the moon is 2.4 x 105 miles from earth. How long does it take light from a source on earth to reach a reflector on the moon and then return to earth? (speed of light is 3.0 x 108 m/s) Conversions: 1 mi- 5280ft 2.54cm = 1in.