What is the minimum flash point of #2 fuel oil in degrees Fahrenheit?

What is the minimum flash point of #2 fuel oil in degrees Fahrenheit?

• A. 100
• B. 80
• C. 140
• D. 120

Answer: (A)

The key idea here is the flash point, which is the lowest temperature at which fuel vapors can form an ignitable mixture with air. For No. 2 fuel oil, the minimum flash point used in many HVAC safety references is 100°F. This means that once the oil is heated to 100°F, its vapors can ignite if there’s a flame or spark present; below that temperature, the vapor concentration isn’t high enough to ignite. This relatively high flash point compared with gasoline shows why heating oil is considered less volatile and safer to handle at room temperature, though it still requires care because heating the oil toward its flash point can create combustible vapors. The value 100°F is the standard minimum cited for No. 2 fuel oil, distinguishing it from fuels with lower flash points (which ignite more easily) or higher thresholds (which aren’t the minimum safety spec).

The key idea here is the flash point, which is the lowest temperature at which fuel vapors can form an ignitable mixture with air. For No. 2 fuel oil, the minimum flash point used in many HVAC safety references is 100°F. This means that once the oil is heated to 100°F, its vapors can ignite if there’s a flame or spark present; below that temperature, the vapor concentration isn’t high enough to ignite. This relatively high flash point compared with gasoline shows why heating oil is considered less volatile and safer to handle at room temperature, though it still requires care because heating the oil toward its flash point can create combustible vapors. The value 100°F is the standard minimum cited for No. 2 fuel oil, distinguishing it from fuels with lower flash points (which ignite more easily) or higher thresholds (which aren’t the minimum safety spec).