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Lesson 2: Scientific Method and Measurements. Scientific method Controlled experiments Early measurements U.S. Conventional System Metric (SI) units Temperature Common Measurements in Aquaponics. What are the components of the scientific method?. Observation

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## Lesson 2: Scientific Method and Measurements

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**Lesson 2: Scientific Method and Measurements**Scientific method Controlled experiments Early measurements U.S. Conventional System Metric (SI) units Temperature Common Measurements in Aquaponics**What are the components of the scientific method?**• Observation • An observation is made regarding some event or characteristic of the world around us • Hypothesis • A guess to find an answer to the observation • Experimentation • The method to prove or disprove the hypothesis • Conclusion • The findings of the experiment**Controlled Experiments**• Designed to test a hypothesis • Carefully planned • Consists of two groups • Test group • Control group**Early Measurements**• Based on the sizes of ordinary objects • foot = length of a mans foot, heel to toe • Yard = distance of nose to tip of out stretched thumb • Accurate or not?**United States Conventional System**• Fluid Volume • Teaspoon, tablespoon, fluid ounce, cup, pint, quart, gallon, bushel, barrel • Weight • Gram, ounce, pound, short hundredweight, short ton, quintal, long ton • Linear Measurement • Inch, foot, yard, mile, furlong, rod, nautical mile • Cubic Measurement (volume) • Cubic inch, cubic foot, cubic gallon, cubic yard • Square Measurement (area) • Square inch, square mile, square yard, square acre, square mile • Power and efficiency • Slug, foot pound, horsepower**Metric System (System International)**• Fluid Volume • Milliliter, centiliter, deciliter, liter, dekaliter, hectoliter, kiloliter • Weight • Milligram, centigram, decigram, gram, dekagram, hectogram, kilogram • Length • Millimeter, centimeter, decimeter, meter, dekameter, hectometer, kilometer • Cubic Measurement (Volume) • Cube everything in length • Square Measurement (Area) • Square everything in length**Temperature**• The temperature scale used in the United States is Fahrenheit but, worldwide and in most sectors of the scientific community Celsius is used. When discussing absolute temperature, Kelvin is used • Conversions = • C = 5/9(F-32) • F = (9/5C)+32 • K = C + 273.16**Common Measurements in Aquaponics**• Dry and Liquid Weights • Fish food • Plant fertilizer • Water conditioner • pH adjusting chemicals • Weight of plants when introduced to system • Weight of plants at harvest • Weight of fish when introduced to system • Weight of fish at harvest**Common Measurements in Aquaponics**• Fluid Volume • Total volume of water in tank • Amounts removed and added during water changes or maintenance.**Common Measurements in Aquaponics**• Linear Measurements • Length, width of plants introduced to system • Length, width of plants at harvest • Length, width of fish at introduction to system • Length, width of fish at harvest**Common Measurements in Aquaponics**• Area • Size of grow bed for plants • Temperature • Using thermometers, one submersible for fish tank • Water temperature • Air temperature**Activity**• You are to perform the problems given on the worksheet in groups of 2. • Once finished with the worksheet, you are each, as individuals to develop a theory based on observation about the ecosystem and symbiotic relationships in the Aquaponics system. Write this on the back of your worksheet.

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