An airport can be cleared of fog by heating the air. The amount of heat required, H(T ,ω) (in calories per cubic meter of fog), depends on the temperature of the air, T (in ◦C), and the wetness of the fog, ω (in grams per cubic meter of fog). Figure 8.4 shows several graphs of H against T with ω fixed.
(a) Estimate H(20, 0.3) and explain what information it gives us.
(b) Make a table of values for H(T ,ω). Use T = 0, 10, 20, 30, 40, and ω = 0.1, 0.2, 0.3, 0.4.

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H (calories/m³) 600 500 400 300 200 100 0 10 20 Figure 8.4 30 H(T,0.4) H(T,0.3) H(T,0.2) H(T, 0.1) T (°C) 40