International System of Unit SI:

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Science Notes
Metrics
10/14/08
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International System of Units (SI)

• standard system of measurements based on
  multiples of ten

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Why do we use a system of measurements?

• In science we need to have accurate and precise
  communication
• A measurement of 1 means nothing UNLESS it has
  units.

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A Measurement Has Three Parts

• The numerical value which tells how much
• The unit, which tells us what the measurements
  are in
• The type of measurement

25 cm
VALUE
MEASURING LENGTH
UNIT
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1. Liquid Volume the amount of space a liquid
takes up

• Unit of measurement
• is liter (L)
• - Scientific tool use to measure liquid volume is
  a graduated cylinder
• - Example 1 L the volume of a medium water
  bottle

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Read at the meniscus, lowest point of the liquid
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Finding the Volume of a Solid

• A. Regular Shaped Objects (cube)
• Volume L X W x H
• Volume cm x cm x cm
• Volume cm3

H E I G H LENGTH T
WIDTH
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Example Volume L x W x H Volume 3.80 cm x
2.60 cm x 3.80 cm Volume 37.54 cm3
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B. Volume - Irregular Shaped Object

• Fill a graduated cylinder to a certain level with
  water.
• Next, put the object in see how much the water
  rises up.
• Then subtract the
• original level from the
• second water level to
• find the volume.
• 1 mL 1 cm3

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2. Length the distance between two points

• Standard (base) unit of measure is meter (m)
• Large distances measured in kilometers (km)

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• Smaller distances are measured in centimeters
  (cm) or millimeters (mm)
• Use metric ruler or meter stick to measure length
  
• Example 1m distance from the floor to
  the doorknob

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3. Mass the amount of matter in an object

• Matter is anything that takes up space
• Unit of measurement is gram (g)
• Large measurements are measured in kilograms (kg)
  

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Mass

• 1000 grams 1 kg
• Scientific tool used to measure mass is a balance

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MASS VS WEIGHT

• Is defined as the force of gravity on the object
• Measured with spring scale
• Changes from planet to planet

• is the same
• wherever you are

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You will need to label the following on a triple
beam balance

• PAN BEAMS
• Zero RIDERS POINTER
• Adjustment
• Knob

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4. Temperature

• A measure of the average energy of motion of the
  particles of a substance
• The more the particles move the higher the
  temperature
• The less the particles move the colder the
  temperature
• Unit of measurement is degrees Celsius ºC
• Water freezes at 0ºC and boils at 100 ºC

PowerPoint Created by Kim Allen - EPS 2008