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INV. 6 (PART 3)

INV. 6 (PART 3). CONDENSATION AND DEW POINT. Think Review: I can read your mind. What have you done to prove that there is water vapor in the air? How did heat transfer play a role in proving the condensation? What did you do to show evaporation is the reverse of condensation?

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INV. 6 (PART 3)

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  1. INV. 6 (PART 3) CONDENSATION AND DEW POINT

  2. Think Review: I can read your mind. • What have you done to prove that there is water vapor in the air? • How did heat transfer play a role in proving the condensation? • What did you do to show evaporation is the reverse of condensation? • How did heat transfer play a role in the evaporation of water from your hand?

  3. Ponder This… • Is there a temperature at which condensation starts to happen? • Will condensation take place at any temperature if you allow enough time for energy transfer to occur? • Discuss each question with partner. • Write what you think dew point is above your LOL line.

  4. PROCEDURE • Watch Resource Video (Conducting 6:3) • Add 1 ice cube at a time and stir. Repeat slowly and patiently until condensation forms. • Once you see ‘fog’ on outside of cup, pull out ice and record temperature and Yes for condensation. • Pour back and forth from cup to cup, recording temp. and yes/no for condensation. • The dew point is the highest temperature at which condensation occurred.

  5. CONDENSATION CHART

  6. REPORT RESULTS • Each group will report dew point on class chart. • Everyone will find the mean in their notes. • Add all numbers together • Divide the sum by the number if numbers you began with • The quotient is the mean, or average, for the class.

  7. DEW POINT • Some people may call condensation on the side of a glass dew. • What is dew? • How does dew form? • Use a concept map to record notes about dew point. Add to it for each and every bullet point by paraphrasing or through graphics.

  8. Dew point • Dew point is a temperature • Celsius or Fahrenheit • Definition: The temperature at which air is saturated. • Saturation occurs when water vapor turns into a liquid. • What are some examples of dew? (add three to your concept map)

  9. DEW POINT QUESTIONS • Complete with shoulder partner pg. 35 from lab notebook titled “Dew Point Questions” • When responding, use specific science words, great conventions, and neat penmanship. • Ten minute timer, and then we will review. (teacher: prepare for dry/wet bulb)

  10. THERMOMETERS • One way to figure out relative humidity is to compare the readings of dry-bulb and wet-bulb. • Do you remember what happened when you conducted the investigation? • We’ll use those numbers to find relative humidity. • Reminder: RH is the amount is a percentage that compares current water vapor to the amount needed to saturate the air.

  11. RH Scavenger Hunt • Open the lab book to page 79 • Read the chart titles and intervals. • When 5 minutes is up: record the two temperatures. What is the difference? • Find dry bulb temp. on left side of chart and match it to the temp. difference along the top. • Find the intersection and you find the RH.

  12. READING: Dragon’s Breath • Under the Dew Point concept map, write thorough and comprehensive responses to (cite page numbers and use scientific verbiage): • What is relative humidity • What is dew point and what does it have to do with Dragon’s Breath? • Why does fog form on bathroom mirrors and car windows. • On what kind of day would it be possible to create frozen dragon’s breath?

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