MEASUREMENT &

SCIENTIFIC TOOLS

The International System Of Units• The International System of Units (SI Units)- the

internationally accepted system for measurement.

• They use a standard of measurement called base units and a set of prefixes to tell the size of the unit.

• Easy to convert one SI unit to another because SI is based on units of ten

Common SI Units & ConversionsMeter (m)- the basic SI unit for length(distance)

Grams (g)- The basic SI unit for mass.• Mass is a measure of the amount of matter in an object

Volume- the amount of space matter occupies.• Solids – cubic meters (m3)• Liquids- liters (l)

Temperature-measure of how hot or cold something is.measure in:

• Celsius(C)• Kelvin (K)

Kittens Hate Dogs Because Dogs Can't Meow

KILO HEKTA DEKA BASE DECI CENTI MILLI

.005 km   .05 hkm  .5 dkm 5m  50 dg 500 cm 5,000 mm 

           7cm               20 ml

       15g      

30 km                          

             

Kittens Hate Dogs Because Dogs Can't Meow

KILO HEKTA DEKA BASE DECI CENTI MILLI

.005 km   .05 hkm  .5 dkm 5m  50 dg 500 cm  5,000 mm 

 .00007  .0007 .007 dkm   .07m  .7dm  7 cm 70 mm  .00002 .0002   .002 dkl  .02 l  .2 dl  2cl  20 ml

 .015  .15  1.5  15g 150dg  1,500 cg  15,000 mg 

30 km  300   3,000  30,000 300,000  30,000,000  300,000,000              

             

Significant Figures• The # of digits in a measurement that you know with a

certain degree of reliability.

• Limit to 2 significant figures after the decimal.

Ex: • 127.654321 = 127.65

• 56.28765 = 56.29

Scientific ToolsTool- anything that helps you do a task.

Measuring Lengths & Distances (m):• Rulers• Meter sticks• tape measure

Measuring Volume of a liquid (l):• Graduated cylinders• Beakers• Flasks• Test tubes

Measuring Mass of an object (grams-g)Triple beam balance

Measuring Temperature ( Celsius or Kelvin)Thermometer

Measuring time ( seconds(s), min (m)):stopwatch

Safety Tools:• Goggles• Lab coats• Gloves • tongs• Tweezers

Analyzing Tools:• Pencil/pens• Log book• Computers• Calculator• Camera

Other Tools:• Eye droppers• Microscope• Magnifying glass• Hot plates• Trays• Scalpels• Glass stirrer• Mortar and pestle• Binoculars• compass