Final answer:
The average temperature at the floor of a flashed over fire can reach several hundred degrees Celsius, which is extremely dangerous.
Step-by-step explanation:
The average temperature at the floor of a flashed over fire can vary depending on several factors such as the type of fuel, size of the fire, and ventilation. In general, the temperature at the floor of a fire can be extremely high, reaching several hundred degrees Celsius.
For example, in a study conducted by the National Institute of Standards and Technology (NIST), the temperature at the floor level of a room with a fully developed fire reached around 600-800 degrees Celsius.
It is important to note that these temperatures are extremely dangerous and can cause severe burns or even be fatal if a person were to come into direct contact with the floor during a fire.