The heat index is a temperature which tells you how hot it feels as a result of the

Chapter 8, Problem 11

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The heat index is a temperature which tells you how hot it feels as a result of the combination of temperature and humidity. See Table 8.3. Heat exhaustion is likely to occur when the heat index reaches 105F. (a) If the temperature is 80F and the humidity is 50%, how hot does it feel? (b) At what humidity does 90F feel like 90F? (c) Make a table showing the approximate temperature at which heat exhaustion becomes a danger, as a function of humidity. (d) Explain why the heat index is sometimes above the actual temperature and sometimes below it. Table 8.3 Heat index (F) as a function of humidity (H%) and temperature (T F) H T 70 75 80 85 90 95 100 105 110 115 0 64 69 73 78 83 87 91 95 99 103 10 65 70 75 80 85 90 95 100 105 111 20 66 72 77 82 87 93 99 105 112 120 30 67 73 78 84 90 96 104 113 123 135 40 68 74 79 86 93 101 110 123 137 151 50 69 75 81 88 96 107 120 135 150 60 70 76 82 90 100 114 132 149