Dry chemical powders are substances used primarily for fire suppression. They work by interrupting the chemical reaction of a fire, effectively smothering flames. Common types include ABC powder, which is effective against ordinary combustibles, flammable liquids, and electrical fires, and BC powder, which is suitable for flammable liquids and gases. These powders are stored in fire extinguishers and are released when needed. They are favored for their effectiveness and ease of use. However, they can create a mess and may require cleanup after use. Proper training is essential for effective application in emergency situations.