What is the best substance to use for extinguishing small kitchen fires?

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Baking soda is the best substance to use for extinguishing small kitchen fires, especially those involving grease or oil. When baking soda is heated, it releases carbon dioxide, which can help smother the flames by cutting off the oxygen supply. This is crucial for effective fire suppression, as fires require oxygen to continue burning.

In contrast, using water on grease fires can actually make the situation worse because water may cause the burning oil to splatter and spread the fire further. Flour, while it might seem like a potential extinguishing agent, can also be flammable and could exacerbate a fire. Oil should never be used on any fire, as it is a fuel source that can lead to an even larger blaze. Therefore, choosing baking soda as the fire extinguisher helps to safely and effectively address small kitchen fires.