True or False: You should not try to put out a gasoline or diesel fire with water.

The statement is true. Attempting to put out a gasoline or diesel fire with water is highly dangerous and ineffective. When water is poured on a burning gasoline or diesel fire, the water can spread the flames instead of extinguishing them. This is because gasoline is less dense than water and will float on top, leading to a wider spread of the fire.

Instead, using an appropriate fire extinguisher, such as one rated for flammable liquids (Class B fire extinguisher), is recommended. These extinguishers use chemicals that can effectively suppress these types of fires by cutting off the oxygen supply or interrupting the chemical reaction needed for combustion. Therefore, knowing that water should never be used in this scenario is critical for safety and effective fire response.