Ketosis occurs when the body does not have any glucose stores left. So it has to switch to some other process to get energy. One process is gluconeogenesis in which the body creates glucose from fat/protein. The other is ketosis which is literally referes to the creation of ketone bodies from fat/protein.
C'mon Baby, Light My Fire. The ingredients needed to start a fire are traditionally illustrated in the fire triangle. The three legs of the triangle are fuel, oxygen and heat. When enough of these three factors is present, a chemical reaction occurs that results in fire. This is why you can start a fire with two sticks: The fuel is the sticks, the oxygen comes from the air and fiction provides the necessary heat. But this is far from the only circumstance in which friction starts a fire.
Fire Prevention. A fire needs three elements - heat, oxygen and fuel. Without heat, oxygen and fuel a fire will not start or spread. A key strategy to prevent fire is to remove one or more of heat, oxygen or fuel. The risk assessment should include detail on all three elements to minimise the risk of a fire starting/ spreading.