Answer :
Final answer:
Flashover in physics refers to a fire scenario with a descending smoke layer that lessens the effective ventilation area of the room, by reducing space for heat and gases to escape. It corresponds to a known principle of insulation where available space for airflow determines whether air an act as a insulator or a conductor.
Explanation:
Flashover refers to the moment during a fire when all exposed surfaces and objects within a space ignite simultaneously. In the context of the question, 'layer' more than likely refers to the smoke layer that forms in a room during a fire.
When the layer descends (i.e., gets lower), the effective ventilation area of the open spaces of the room is actually decreased. This is because a lower layer means less space for heat and gases to escape, thus leading to a higher concentration and temperature within the room, and causes a reduction in the effective ventilation.
This correlation can be understood better if we take the example of a house. For example, the space between the inside and outside walls of a house uses the principles of insulation to maintain the interior temperature. If this space is filled, convection can be hindered, reducing the effectiveness of ventilation.
Learn more about Flashover
brainly.com/question/36745522
#SPJ11
