At the burner nozzle of the gun assembly for an oil furnace, what is combined with air?

At the burner nozzle of the gun assembly for an oil furnace, oil is combined with air to create the necessary mixture for combustion. The nozzle atomizes the oil, breaking it into small droplets which then mix with air. This process is crucial for efficient combustion, as it allows the oil to burn quickly and evenly, generating heat.

While options like gas, water, and fuel may seem relevant, they do not directly pertain to the specific process occurring at the burner nozzle in an oil furnace. Gas typically refers to natural gas or propane systems, which differ in operation from oil furnaces. Water is not involved in the combustion process at the burner nozzle. Fuel, although it does refer to materials that can be burned for energy, is a broader term and does not specifically denote the oil used in this context, making it less precise than saying oil directly.