Which method is NOT a consequence of increasing gas pressure in a furnace?

Increasing gas pressure in a furnace generally leads to several key effects on combustion and flame characteristics. One effect is an increase in flame temperature. When gas pressure is raised, more gas can be mixed with the air and burned more efficiently, contributing to a higher temperature in the flame. This is important for achieving optimal combustion in many heating applications.

Additionally, higher gas pressure can enhance flame stability. A stable flame is crucial for ensuring consistent heating and efficient operation; increased gas pressure typically results in a more robust flame that maintains its form and burns more steadily.

Moreover, higher combustion efficiency is another consequence of increased gas pressure. With a better fuel-air mixture and more complete combustion, energy loss is minimized, resulting in a more efficient heating process.

In contrast, a decrease in flame temperature would not be a typical result of increased gas pressure. Higher pressure generally does not lead to a cooler flame; rather, it usually contributes to more energy being released in the combustion process, which elevates the flame temperature. Therefore, the assertion that an increase in gas pressure causes a decrease in flame temperature is inconsistent with the fundamental principles of gas combustion in a furnace.