On a bitterly cold, snowy morning, the air temperature and dew point of the outside air are both –7°C. If this air is brought indoors and warmed to 21°C, with no change in vapor content, what is the relative humidity of the air inside the home? (Hint: See Table, p. 107.)
Table Saturation Vapor Pressure over Water for Various Air Temperatures*
AIR TEMPERATURE | SATURATION VAPOR PRESSURE | AIR TEMPERATURE | SATURATION VAPOR PRESSURE | ||
(°C) | (°F) | (MB) | (°C) | (°F) | (MB) |
–18 | (0) | 1.5 | 18 | (65) | 21.0 |
–15 | (5) | 1.9 | 21 | (70) | 25.0 |
–12 | (10) | 2.4 | 24 | (75) | 29.6 |
–9 | (15) | 3.0 | 27 | (80) | 35.0 |
–7 | (20) | 3.7 | 29 | (85) | 41.0 |
–4 | (25) | 4.6 | 32 | (90) | 48.1 |
–1 | (30) | 5.6 | 35 | (95) | 56.2 |
2 | (35) | 6.9 | 38 | (100) | 65.6 |
4 | (40) | 8.4 | 41 | (105) | 76.2 |
7 | (45) | 10.2 | 43 | (110) | 87.8 |
10 | (50) | 12.3 | 46 | (115) | 101.4 |
13 | (55) | 14.8 | 49 | (120) | 116.8 |
16 | (60) | 17.7 | 52 | (125) | 134.2 |
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