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**DPT & Relative Humidity Charts**

Handy Dandy Earth Science Reference Tables Page 12

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**The “Dry Bulb” Don’t let it fool you. It is just a thermometer.**

It measures the air temperature. Duh! 20°C

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**The “Wet Bulb” Has a little wet booty tied to the bottom.**

Gets cool when water evaporates. 12°C Wet Booty

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**A Dry Day… A lot of moisture will evaporate.**

The wet bulb will be a lot cooler than the dry bulb. 20°C 20°C 14°C 12°C 8°C Difference between wet bulb & dry bulb is 12 °C.

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**A Humid Day… A little bit of moisture will evaporate.**

The wet bulb will not be much cooler than the dry bulb. 20°C 14°C Difference between wet bulb & dry bulb is 6 °C.

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**Page 12 of your Handy Dandy Earth Science Reference Tables**

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 #3: The wet bulb temp IS NOT the DPT.

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**Dry-bulb temperature is your air temperature.**

20 °C

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14 °C

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4 °C

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

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20°C 14°C 20-14=6

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18°C 16°C 18-16=2

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

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

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**The Dew Point Chart works the same way**

14-10=4 Dew Point = 6°C

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**Try These. 57% 17 °C 86% 4 °C 57% 4 °C 91% 16 °C 100% 14 °C 45% -9 °C**

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% 17 °C 86% 4 °C 57% 4 °C 91% 16 °C 100% 14 °C 45% -9 °C

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**More Difficult. 82% 18 °C 45.5% -.5 °C 100% 17 °C 20% -17 °C 69%**

Dry Bulb Wet Bulb R Humidity DPT 21°C 19°C 11°C 6 °C 17 °C 17°C 2°C -3 °C 9°C 6.5 °C 70°F 60 °F 82% 18 °C 45.5% -.5 °C 100% 17 °C 20% -17 °C 69% 3.5 °C 15 °C 21 °C 52% 11 °C(50 °F)

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The End

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Area under curves Consider the curve y = f(x) for x [a, b] The actual area under the curve is 83.60 units 2 The approximate area is the sum of areas.

Area under curves Consider the curve y = f(x) for x [a, b] The actual area under the curve is 83.60 units 2 The approximate area is the sum of areas.

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