Scientific Measurement

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Presentation transcript:

Scientific Measurement

Scientists use the International System (SI) of Measurement Each unit is 10 times smaller or larger than the next Prefixes are used to indicate the size of the unit

Metric Prefixes Prefix Symbol Meaning Value *kilo- k Thousand 1000 hecto- h Hundred 100 deka- da Ten 10 (none) One 1 deci- d Tenth 1/10 *centi- c Hundredth 1/100 *milli- m Thousandth 1/1000

Types of Measurement Mass = the amount of matter an object contains Unit: gram (g); the SI unit is the kilogram (kg) Tool: balance

Types of Measurement 2. Length = the distance between two points Unit: meter (m) Tools: ruler, meter stick, measuring tape, etc.

Types of Measurement 3. Volume = the amount of space an object occupies Units: (1) for solids – cubic centimeter (cm3) (2) for liquids or gases – liter(L) Tool: a graduated cylinder (liquids)

Types of Measurement 4. Temperature = the measure of heat in an object Unit: celsius degree (Co) Tool: thermometer

Steps used by scientists in order to solve problems Scientific Method Steps used by scientists in order to solve problems

Scientific Method Determine a Problem Must be testable (cannot be opinion) Example Who is the prettiest girl in the class? OR Who is the tallest girl in the class?

Scientific Method 2. Form a Hypothesis a testable statement that suggests an answer to the problem Example If all the heights of the girls in the class are measured, then Jane should be the tallest.

Scientific Method 3. Design an Experiment The best experiments test only one variable at a time The variable that is changed during the experiment is the independent (manipulated) variable

Scientific Method The variable that is being observed/measured is the dependent (responding) variable All other conditions are constant (don’t change) The test group with normal conditions is the control

Scientific Method Record Data Quantitative data uses numbers (counts, measurements) Qualitative data uses observations (smell, color)

Scientific Method Analyze the Results should be arranged in tables, charts, and/or graphs Draw Conclusion(s) Must state if the data rejected or supported the hypothesis

Scientific Method Revise or Repeat If the hypothesis is rejected, revise (the hypothesis or experiment) before doing again If the hypothesis is supported, repeat the experiment to verify your results

Scientific Theory – natural phenomenon supported by a large body of experimental evidence - can be changed with additional evidence Scientific Law – natural law accepted as fact (gravity)