The fire point of an oil is about ________ higher than the flash pointa.5-30oCb.5-40oCc. 5-20oCd.5-10oC

Breakdown the Problem

1. We need to find out the difference between the fire point and the flash point of oil.
2. There are four answer options related to this difference in degrees Celsius.

Relevant Concepts

• The flash point is the lowest temperature at which the vapors of a volatile material will ignite, while the fire point is the temperature at which enough vapor is present to sustain combustion.
• Typically, the fire point is always higher than the flash point.

Analysis and Detail

1. Commonly, the fire point is generally accepted to be around 10°C to 30°C higher than the flash point.
2. We will evaluate the options provided:
   • a. 5-30°C
   • b. 5-40°C
   • c. 5-20°C
   • d. 5-10°C

Verify and Summarize

The options suggest a range for the difference between the fire point and the flash point. Given that common differences in various types of oils are typically within a range of about 10-30°C, we can conclude that the option "a. 5-30°C" is the most plausible as it covers the widest range of possibilities.

Final Answer

The fire point of an oil is about 5-30°C higher than the flash point (Option a).