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Measurement
How do you measure? ToolsUnitsSI base Unit Mass Volume Distance Temperature
Metric System 1km = 1000 m = cm = mm All these measurements are the same distance….but which is easier to read? Which measures the largest amount of distance….km, m, cm, or mm?
KILO 1000 Units HECTO 100 Units DEKA 10 Units DECI 0.1 Unit CENTI 0.01 Unit MILLI Unit Meters Liters Grams Ladder Method How do you use the “ ladder ” method? 1 st – Determine your starting point. 2 nd – Count the “ jumps ” to your ending point. 3 rd – Move the decimal the same number of jumps in the same direction. 4 km = _________ m How many jumps does it take? Starting Point Ending Point 4. 1 __. 2 3 = 4000 m
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Displacement- water that is moved aside when an object is placed in a graduated cylinder; a method to measure the volume of an object using a liquid Meniscus- a bowl shaped line that is used to measure water levels
Which side of this ruler allows you to measure with more precision? Why?
Precision and Accuracy Accuracy- depends on the difference between a measurement and an actual value. – Ex. You look at a stream and estimate that it is 1m to the other side. You measure the width the best you can without getting wet and find it is 1.32m. Later you find out that it actually measure 1.14m. Your estimate was more accurate that your measurement. Precision- The exactness and consistency of measurements. (The level of detail in the measurement) – EX. Measurements made with a ruler with cm and mm is more precise than a ruler with only cm.
Try these conversions using the ladder method mg = _______ g 1 L = _______ mL160 cm = _______ mm 14 km = _______ m109 g = _______ kg 250 m = _______ km Conversion Practice Compare using, or =. 56 cm 6 m 7 g 698 mg m < 7000mg >
Karli Kelly Kyle Kevin Lauren Aaron Ryan Therese 1. Identify 2 lab safety rules being broken. 2. Identify 2 lab safety rules that are being done. 1. Identify 2 lab safety rules being broken. 2. Identify 2 lab safety rules that are being done.
Measurement Exit Slip 1. What is the SI Unit of Mass? Volume? Length? 2. Which is larger 300mm or 3 cm? Explain. 3. Explain how to find the volume of a penny using water and a graduated cylinder. 4. How do you make sure the measurement is both precise and accurate?