Scientific method and the metric system
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Scientific Method and the Metric System. The Scientific Method Scientific method : a logical approach to solving problems by observing and collecting data, formulating hypotheses, and formulating theories that are supported by data. Observing and Collecting Data.

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Scientific method and the metric system

Scientific Method and the Metric System

The Scientific Method

Scientific method: a logical approach to solving problems by observing and collecting data, formulating hypotheses, and formulating theories that are supported by data

Observing and collecting data
Observing and Collecting Data

  • Observing: the use of the senses to obtain information

    • Qualitative-descriptive

    • Quantitative-numerical

  • System: a specific portion of matter in a given region of space that has been selected for study during an experiment or observation

Formulating hypotheses
Formulating Hypotheses

  • Hypothesis: A testable statement

    • Serves as a basis for making predictions and for carrying out further experiments

    • Often “if-then” statements

    • Logic

Testing hypotheses
Testing Hypotheses

  • Requires experimentation that provides data to support or refute a hypothesis or theory

  • If the data does not support the predictions, then the generalizations on which the predictions were based must be discarded or modified


  • When the data from experiments confirm the hypothesis, scientists use models to explain what they observed

  • Model: in science is more than a physical object: it is often an explanation of how phenomena occur and how data or events are related.

    • If a model successfully explains a phenomena, it may become part of theory

  • Theory: broad generalizations that explains a body of facts or phenomena

Scientific method is not
Scientific Method is NOT…

  • LINEAR!!!

  • It IS….complicated and messy

Versions of the scientific method
Versions of the scientific method

More versions of the scientific method
More versions of the scientific method


Units of measurement
Units of Measurement

  • You are constantly measuring things (whether you realize it or not)- what units are you most familiar with?

A few ideas
A few ideas

  • Height- feet/inches (5’8”)

  • Temperature- F not Celsius

  • Baking- 1 cup, 1 tablespoon, 1 teaspoon

  • Drinks- 12 ounces (can of soda)

  • Weight- pounds (???lbs)

  • Distance- miles

Si measurement
SI Measurement

  • SI- a single measurement system adopted in 1960 by the General Conference on Weights and Measurements

    • Contains 7 base units and many derived

Scientific method and the metric system

  • Mass- measure of the quantity of matter

  • SI unit-kilogram

  • Weight- measure of the gravitational pull on matter

    • Mass does not depend on such as attraction

    • Which is why your WEIGHT changes if you go to the moon (1/6 to be exact)

Mountain dew mass demo
Mountain Dew Mass Demo

Who drank a soda yesterday

What was it?

Did you notice the sugar content?

What was the unit of measure in?

Can you visualize how much sugar you are actually consuming in a 12oz of soda?


  • SI unit- meter

  • United States-miles

  • Everyone else-kilometers

How tall are you in meters?!

1 foot = 0.3048 meters

If you are 5’4” so in meters you are 1.6256m

Derived si units
Derived SI Units

  • Derived units- combinations of SI base units


  • Volume: the amount of space occupied by an object

  • SI unit-m3

  • Non-SI unit-Liters

  • 1000mL=1L

  • 1000cm3=1Liter

  • 1L=1000mL=1000cm3


  • Always remember:

    • I DENSITY!!!!



  • Density: the ratio of mass to volume or mass/volume

  • SI derived units: mass (kg) and volume (cubic meter) kg/m3

  • Characteristic physical property of a substance

  • Density varies with temperature; generally density decreases with increasing temperature

Si prefixes
SI prefixes

Conversion factors
Conversion Factors

  • Conversion factor: a ratio from the equality between two different units that can be used to convert from one unit to the other

How many minutes are in a day?

1440 minutes

How did you do it?

Minutes in a day
Minutes in a day

  • _____ minutes per day= 60 minutes/1 hour x 24 hours/ day

  • Answer: 1440 minutes/day

Handy equation
Handy equation

  • Quantity sought= quantity given x conversion factor

Derive conversion factors
Derive conversion factors

  • Derive conversion factors if you know the relationship between the unit you HAVE and the unit you WANT

Example: Express a mass of 5.712 grams in milligrams and in kilograms



1kg=1000 grams


  • 5.712 grams x 1000mg/1gram=5712milgrams

  • 5.712grams x 1 kg/1000grams =.005712kg

Practice makes perfect
Practice makes perfect

  • Complete the following conversions:

  • 10.5g=____kg

  • 1.57km=____m

  • 1.2L=_____mL

  • 358cm=_____m

  • 3548.6mL=_____cm3


  • Complete the following conversions:

  • 10.5g=.0105 kg

  • 1.57km= 1570 m

  • 1.2L=1200mL

  • 3548.6mL= 3548.6 cm3

Density problem
Density problem

  • The density of gold is 19.3g/cm3.

  • What is the volume, in cm3, of a sample of gold with mass .715kg?


  • 37.05cm3

  • ____cm3=.715kg x 1000g/1kg x 1cm3/19.3g