Metric System

SI System Standard International System of measurement – metrics Has seven base units and many other units derived from these seven

Seven Base Units Quantity Unit Abbreviation length meter m mass gram g time second s temperature kelvin K amount mole mol current ampere amp intensity candela cd

Mass vs Weight Mass is not the same as weight Mass is the amount of matter in a substance Weight is a measure of the pull of gravity on the substance Can you be weightless? Can you be massless?

Derived Units Many other units are used in the metric system, but they are combinations of the base units Speed - meter per sec (m/sec) Volume volume = length x width x height (m) x (m) x (m) = m3 .001 m3 = 1 liter (L) 1 cm3 = 1ml

Prefixes Metric system utilizes prefixes which indicate multiples of 10 of the unit kilo- k 1000 hecto- h 100 deka- da 10 deci- d .1 centi- c .01 milli- m .001

Converting Between Metric Units 3.65 dam = __________cm 2587 mm = __________hm .0087 hl = __________cl

More Prefixes Mega- M 106 Micro- u 10-6 Nano - n 10-9 Pico- p 10-12

Use the appropriate prefixes 3 x 106 L 15 x 10-9 g 8 x 108 m 3.5 x 10-6 L 1.46 x 1010 g

Temperature Metric unit – Kelvin – not used for measurement Measured in C (celsius) K = C + 273.15 Old system is F (farenheit) C = 5/9 (F -32) What is 69 F in C and K?

Temperature is an intensive property- does not depend on the amount Extensive properties do depend on the amount In the statement “a yellow sample is solid at 25 C. It weighs 6.0g and has a density of 2.3g/cm3” what are the intensive and extensive properties?