Which statement is correct regarding Class 1 flammable liquids?

Which statement is correct regarding Class 1 flammable liquids?

• A. They have a flash point below 100 degrees Celsius
• B. They have a flash point at exactly 100 degrees Fahrenheit
• C. They have a flash point above 100 degrees Fahrenheit
• D. They have a flash point below 100 degrees Fahrenheit

Answer: (D)

Class 1 flammable liquids are defined by having a flash point below 100 degrees Fahrenheit. The flash point is the lowest temperature at which enough vapor from the liquid can mix with air to form an ignitable mixture with a source of ignition. Because the threshold is below 100°F, liquids that ignite at temperatures under that mark are classified as Class 1. The statement describing them as having a flash point below 100°F is the correct description. The idea of a flash point below 100°C doesn’t fit the standard, since the classification uses Fahrenheit, and 100°C is much higher than 100°F. A flash point exactly at 100°F isn’t the boundary for Class 1, and a flash point above 100°F would place the liquid into a different (non–Class 1) category.

Class 1 flammable liquids are defined by having a flash point below 100 degrees Fahrenheit. The flash point is the lowest temperature at which enough vapor from the liquid can mix with air to form an ignitable mixture with a source of ignition. Because the threshold is below 100°F, liquids that ignite at temperatures under that mark are classified as Class 1. The statement describing them as having a flash point below 100°F is the correct description. The idea of a flash point below 100°C doesn’t fit the standard, since the classification uses Fahrenheit, and 100°C is much higher than 100°F. A flash point exactly at 100°F isn’t the boundary for Class 1, and a flash point above 100°F would place the liquid into a different (non–Class 1) category.