A Standard Measurement System (pp17-26)
         Using SI as the standard system of measurement allows scientists to compare data and communicate with each other about their results.

        Length (Dimension)
            units -  basic unit in SI is the meter (m)

                            centimeter (cm)  1/100 of a meter
                            millimeter (mm)  1/1000 of a meter
                            kilometer    (km)  1000 meters

            measuring length
                            common tool  - metric ruler
 

        Weight and Mass
            Weight - the affect of gravity on an object (it's mass)
                    unit - SI is the Newton (N)

            Mass - a measure of the amount of matter an object contains
                    unit - SI is the kilogram (kg)

        Volume
            the amount of space an object takes up
                    unit - SI is the cubic meter

                    Volume of Liquid
                            meniscus - reading at the bottom of the curve for water
 

                    Volume of Rectangular Solids
                            measures length, width and height

                            V= l X w X h

                    Volume of Irregular Solids
                            use of displacement
                            how much water is displaced when the object in place inside the graduated cylinder

        Density
            relationship betwee mass and volume
            mass per unit volume
            = mass / volume
            unit - SI is kilogram per cubic meter  kg/m³

        Time
            Units of time
                units - SI  is seconds (s)

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