Physical Science The windchill factor is a measure of the cooling effect that the wind has on a person’s skin. It calculates the equivalent cooling temperature if there were no wind.*
Wind (mph) | |||||||||
Temperature (°F) | Calm | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
40 | 36 | 34 | 32 | 30 | 29 | 28 | 28 | 27 | |
30 | 25 | 21 | 19 | 17 | 16 | 15 | 14 | 13 | |
20 | 13 | 9 | 6 | 4 | 3 | 1 | 0 | −1 | |
10 | 1 | −4 | −7 | −9 | −11 | −12 | −14 | −15 | |
0 | −11 | −16 | −19 | −22 | −24 | −26 | −27 | −29 | |
−10 | −22 | 28 | −32 | 35 |
| 39 | −41 | −43 | |
−20 | −34 | −41 | −45 | −48 | −51 | −53 | −55 | −57 | |
−30 | −46 | −53 | −58 | −61 | −64 | −67 | −69 | −71 | |
−40 | −57 | −66 | −71 | −74 | −78 | −80 | −82 | −84 | |
Suppose that we wish to determine the difference between two of the entries in the foregoing table and we are interested only in the magnitude, or absolute value, of this difference. Then we subtract the two entries and find the absolute value. For example, the difference in windchill factors for wind at 20 miles per hour with a 20° air temperature and wind at 3.0 miles per hour with a 10° air temperature is | −12° − 4°| = 16°, or equivalently, |4° − (−12°)| = 16°.
Find the absolute value of the difference between the two indicated windchill factor.
Wind at 25 miles per hour with a −30° air temperature and wind at 15 miles per hour with a −30° air temperature
*Table from the Joint Action Group for Temperature Indices, 2001.
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