6 5 2indact

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6 5 2indact

  1. 1. “Heating Things Up”6.5.2: Evaluate Precision and Usefulness of data based on measurements taken.<br />By Emily Weil<br />10/07/09<br />Content from:<br />
  2. 2. Definitions<br />Precision- accuracy; exactness.<br />Heat- added or external energy that causes a rise in temperature.<br />Energy- source of power; ability to act, cause an effect, etc.<br />Hypothesis-A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation.<br />Experiment- research; investigation (try different ideas to test a hypothesis). <br />Procedure- following a particular series of steps; a process. <br />Degree(s)- unit of measure of temperature (Celsius). <br />Taken from Dictionary.com and the Indiana State Science Standards<br />
  3. 3. Why are precise measurements important?<br />Sometimes estimation is a good idea, but is that true in every case?<br />Consider the following:<br />Maria is running a temperature of 100.6 Degrees. The normal human body temperature is 98.6 Degrees. Many would look at this and say that her temperature is not that far off. However, a temperature of 100 is considered a fever and severe.<br />The human body’s temperature does vary slightly, but at most only 1 Degree. <br />Would rounding be a good idea? 101 is basically 100 isn’t it?<br />
  4. 4. The Experiment<br />Okay, here’s the breakdown of the experiment:<br />We are using the idea of precise measuring and its importance with temperature.<br />The sun produces heat, correct?<br />Objects absorb the heat from the sun’s light.<br />Do all objects absorb the same amount of heat at the same rate?<br />*Does color play a part in this? Does it make a difference?<br />
  5. 5. Gather the required materials<br />3 or more cans that are exactly the same. (soup cans work well)<br />Black, White, and any other color paint you desire to test.<br />Paintbrushes<br />Lamp with a 60 watt light bulb<br />Ruler, or other measuring device<br />Thermometer<br />Measuring Cup/Beaker<br />Water<br />
  6. 6. How Should You Begin?<br />What will your procedure be?<br />How will you make sure you do each can the same way?<br />Here’s an example!<br />(Be precise! Make sure you know every measurement possible!)<br />
  7. 7. Paint the cans<br />Paint one can white, one can black, and if you decide to test any other colors, then paint another can that color.<br />Leave one can without paint!!!<br /> *To be precise, make sure each can is identical (before it’s painted)<br />
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  9. 9. Next Step<br />If you test each can at the same time (best idea), make sure you do each the same way:<br />Measure out equal amounts of water for each<br />Take the temperature of the water in each before you turn on the light.<br />Measure how far away you put the lamp so that you can put it an equal distance from each can.<br />Make sure you don’t lose track of time! (Redo the whole thing if you forget because you want your data to be EXACT!!!!<br />
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  12. 12. How will you record your data?<br />Design a clear and concise way to record your data (keeping in mind that you need to experiment the same way each time)<br />Will you include a picture, or drawing?<br />What will you measure and how often?<br />
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  15. 15. For an example Black Line Master on a way to record your data, go to:http://www.indianastandards.org/files/sci/sci_6_5_2.pdf.<br />
  16. 16. What were your results?<br />Record your results (Keeping them as precise and accurate as possible: DON’T ESTIMATE!)<br />What did you find?<br />Which color can absorbed the most heat?<br />How could you tell?<br />What did the temperature tell you?<br />Think About It!<br />
  17. 17. Example Results:<br />
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  19. 19. Findings<br />Okay, here’s some explanation for what you should have found.<br />The water inside of, or touching, the black can should have shown more of an increase in temperature over time.<br />Why?<br />Black absorbs all colors of light, and thus heat.<br />White reflects all colors of light, so it does not absorb that energy and does not cause the water inside of the can to increase in temperature.<br />
  20. 20. Apply What You Know!<br />Okay, so now you’ve discovered that different colors absorb light and heat at different rates. (Black being the best at absorbing the sun’s heat)<br />How can you use this idea?<br />Have you ever heard of solar power?<br />Well, some people have made devices called solar powered pizza box ovens. Do you think that knowing what absorbs heat quickly would help with that experiment?<br />Design a pizza-oven (solar-powered) using what you’ve discovered in this experiment!<br />
  21. 21. Resources<br />http://www.indianastandards.org/.<br />http://www.hometrainingtools.com/article.asp?ai=1237&bhcd2=1257038854.<br />

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