Heat transfer coefficients for free convection in gases,

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Heat transfer coefficients for free convection in gases, forced convection in gases and vapours, and for boiling water lie, respectively, in the range of

1. 5-15; 20-200 and 3000-50000 W/m²K
2. 20-50,200-500 and 50000-100000 W/m²K
3. 50-100, 500-1000 and 100000-100000 W/m²K
4. 20-100, 200-1000 and a constant 1000000 Wm²K

Correct Option: A

5-15; 20-200 and 3000-50000 W/m²K