Measurement A person can only measure 7 basic
Measurement A person can only measure 7 basic entities. The following are the basic entities • Mass • Time • Amount of matter • Luminosity • Electric current • Distance • Temperature Everything else is a derived unit.
Basic Metric Units Entity Base Unit Name Abbreviatio n Mass Length Time Amount of matter Electric current Luminosity Temperature kilogram meter second mole kg m s mol Amphere Candella Kelvin A Cd K
Metric Prefixes Name Abbreviation Meaning Size Relative to Base Mega Kilo M k All are bigger than the base. Hecto Deca Base Deci Centi Milli Micro h 100 da 10 Any one of the base unit d 1/10 c 1/100 m 1/1000 μ 1/1000000 1000 All are smaller than the base.
Derived Units Derived Unit Density Force Momentum Work Power Acceleration Volume Units kg/m 3 kgm/s 2 Kgm/s Nm Nm/s 2 m 3 and hundreds of others
How to make measurements • There is a 3 step process 1. Study (look at the scale on the tool) the measurement tool you are about to use and determine the value of the smallest marked interval. At this time you must determine if the tool is a metric tool or a non metric scale this dictates the next step. 2. For metric tools you declare the precision too one tenth of the value of the smallest marked interval. 3. Now finally look at the tool and make your measurement and make the measurement match your precision. Lets practice
Metric Scale or Not Metric Scale 0 1 Non Metric Scale 0 0. 25 0. 75 1 Metric Scale 0 0. 5 1
Lets make some measurements!!! Metric Scale 0 Smallest marked Interval ______ Precision _____ Measurement _____ 1 Non Metric Scale 0 0. 75 0. 25 Smallest marked Interval ______ Precision _____ Measurement _____ 1 Metric Scale 0 0. 5 Smallest marked Interval ______ Precision _____ Measurement _____ 1
0. 2 0. 3 0. 4 10 20 30 500 600 700 0. 2 0. 4 0. 6
0. 4 500 10 0. 07 0. 3 400 9 0. 06 0. 2 300 8 0. 05
es l a sc e c i tr e th e m eas r n o ncr you like N i n – PS not n of nt u do cisio eme s. pre asur scale me tric me Non-Metric Scales 0 0 0 1 25 10 2 50 20
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