Metric System SI System The standard for measurement

Metric System & SI System

The standard for measurement in the scientific community today is the metric system. • • We use the metric system for 3 reasons: Easy and convenient because it is universal The rest of the world has been using it for the past 40 years conversions between units are easy, because everything is done in multiples of ten. 10, 1000, 10000, etc. YOU FINISH!

The SI system was adopted by the scientific community around 1960. • The SI system has seven base units one for each of the following: • length meter • mass kilogram • time second • electric current ampere • temperature Kelvin • amount of substance mole • luminous intensity candela

The metric system tells how many, And the SI system tells us of what!

-Length- The meter is the unit for length. We will always use the meter when discussing length. • • 1 km 1 m 1 dm 1 cm 1 mm 1 m 1 nm 5 city blocks floor to doorknob grapefruit button width of dime bacteria cell diameter thickness of RNA 1000 m. 1 m. 001 m. 000000001 m

-volume. Volume is the space occupied by matter. The SI unit for volume is meter cubed. The common unit of measure is the Liter. 1 liter = 1000 centimeters cubed. volume is dependent on temperature. (ex. ice) 1 L 1 m. L 1 cm 1 L a quart of milk 20 drops of water cube of sugar crystal of salt . 001 L. 001 L. 000001 L

-Mass • Mass- quantity of matter an object contains Weight- measure of the pull of gravity of the earth on an object. • Mass Weight • Mass is measured in grams. The SI unit of mass is the kg. A kilogram is the mass of one liter of water at 4 C.

• • 1 kg 1 g 1 mg 1 g small textbook 1000 g dollar bill 10 grains of salt. 001 g particle of baking powder. 000001 g

Sig. Figs. & Accuracy and Precision