Which of the following is the condition of the maximum discharge of flue gases through a chimney in a steam boiler ?
1
The maximum discharge of flue gases through a chimney does not depend on the temperature of flue gases in the steam boiler.
2
The temperature of flue gases is exactly equal to twice the atmospheric temperature in Kelvin units.
3
The temperature of flue gases is equal to the atmospheric temperature in Kelvin units.
4
The temperature of flue gases is slightly greater than twice the atmospheric temperature in Kelvin units.