1. CONDENSATION AND DEW POINT
INV. 6 (PART 3)
CONDENSATION AND DEW POINT
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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?
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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.
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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.
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5. CONDENSATION CHART TEMPERATURE ◦C CONDENSATION Yes or No TG- P.203
Student Lab Notebook

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.
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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.
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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)
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9. (teacher: prepare for dry/wet bulb)
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)
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Student Lab Notebooks- P.35
Teacher Answer Master- P.396

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.
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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.
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Student Resource Book. P.79

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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Student Resource Book. P.34
Teacher Answer Master P.397