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DPT & Relative Humidity Charts Handy Dandy Earth Science Reference Tables Page 12.

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Presentation on theme: "DPT & Relative Humidity Charts Handy Dandy Earth Science Reference Tables Page 12."— Presentation transcript:

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2 DPT & Relative Humidity Charts Handy Dandy Earth Science Reference Tables Page 12

3 The “Dry Bulb” Don’t let it fool you. It is just a thermometer. Don’t let it fool you. It is just a thermometer. It measures the air temperature. It measures the air temperature. Duh! Duh! 20°C

4 The “Wet Bulb” Has a little wet booty tied to the bottom. Has a little wet booty tied to the bottom. Gets cool when water evaporates. Gets cool when water evaporates. 12°C Wet Booty

5 A Dry Day… A lot of moisture will evaporate. A lot of moisture will evaporate. The wet bulb will be a lot cooler than the dry bulb. The wet bulb will be a lot cooler than the dry bulb. 8°C 20°C Difference between wet bulb & dry bulb is 12 °C. 20°C14°C 12°C

6 A Humid Day… A little bit of moisture will evaporate. A little bit of moisture will evaporate. The wet bulb will not be much cooler than the dry bulb. The wet bulb will not be much cooler than the dry bulb. 14°C 20°C Difference between wet bulb & dry bulb is 6 °C.

7 Page 12 of your Handy Dandy Earth Science Reference Tables Warning #1: Be sure to READ the correct chart: DPT or RH Warning #1: Be sure to READ the correct chart: DPT or RH Warning #2: Dew Point Temperature IS NOT “Difference between wet bulb and dry bulb”. Warning #2: Dew Point Temperature IS NOT “Difference between wet bulb and dry bulb”. Warning #3: The wet bulb temp IS NOT the DPT. Warning #3: The wet bulb temp IS NOT the DPT.

8 Dry-bulb temperature is your air temperature. 20 °C

9 14 °C

10 4 °C

11 Subtract (the difference) between the dry bulb and wet bulb

12 14°C 20°C 20-14=6

13 16°C 18°C 18-16=2

14 8°C 20°C 20-8=12 Put it all together Relative Humidity = 11%

15 10°C 14°C 14-10=4 Relative Humidity = 60%

16 10°C 14°C 14-10=4 Dew Point = 6°C The Dew Point Chart works the same way

17 Try These. Dry Bulb Wet Bulb R Humidity DPT 26°C 20 °C 6 °C 5 °C 12 °C 8 °C 18 °C 17 °C 14 °C 0 °C -3 °C 57% °C 17 °C 86% °C 4 °C 57% °C 4 °C 91% °C 16 °C 100% °C 14 °C 45% °C -9 °C

18 More Difficult. Dry Bulb Wet Bulb R Humidity DPT 21°C19°C 11°C 6 °C 17 °C 17°C 2°C -3 °C 9°C 6.5 °C 70°F 60 °F 82% °C 18 °C 45.5% °C -.5 °C 100% °C 17 °C 20% °C -17 °C 69% °C 3.5 °C 52% °C (50 °F) 11 °C (50 °F) °C 21 °C °C 15 °C

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