Z-102

Z

160

150

140

130

120

110

100

90

80

70

60

50

40

32

10 20 30 40 50 60 70 80 90 100 110120130140150160

DEWPOINT TEMPERATURE (F)

AIR

TEM

PER

ATUR

TE (

F)

2 5 10 2030 9050

40 100806070

% HUMIDITY

70

65

60

55

50

45

40

35

30

25

20

15

10

5

0

-10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70DEWPOINT TEMPERATURE (C)

AIR

TEM

PER

ATUR

E (C

)

25

1020

30 40 50 6070

8090

100

% HUMIDITY

To determine the dewpointtemperature: After measuring the airtemperature and relative humidity, usethe graph by drawing a horizontal linefrom the air temperature (Y-axis) to theappropriate relative humidity line. Thendraw a vertical line from thatintersection down to the dewpointtemperature (X-axis).

Dew Point

Charts based on:

td - ta17.5 (td + 240.97)H =100

where H = relative humidity (%)td = dewpoint temperature (C)ta = air temperature (C)

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