Metric System & SI System

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# Metric System & SI System - PowerPoint PPT Presentation

Metric System &amp; 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

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### 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, 100, 1000, 10000, etc. YOU FINISH!
• 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.
• 1km- 5 city blocks 1000m
• 1m floor to doorknob
• 1dm grapefruit .1m
• 1cm button .01m
• 1mm width of dime .001m
• 1m bacteria cell diameter .000001m
• 1nm thickness of RNA .000000001m

-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)

1L a quart of milk

1mL 20 drops of water .001L

1cm cube of sugar .001 L

1L crystal of salt .000001 L

-Mass-
• Mass- quantity of matter an object containsWeight- 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.

1kgsmall textbook 1000g

• 1g dollar bill
• 1mg10 grains of salt .001g
• 1g particle of baking powder .000001g