Flammable gases are substances that can easily ignite and burn when exposed to an open flame or spark. Common examples include propane, butane, and methane. These gases are often used in heating, cooking, and industrial processes due to their energy content. When flammable gases are released into the air, they can form explosive mixtures with oxygen. This makes proper storage and handling essential to prevent accidents. Safety measures, such as using gas detectors and ensuring good ventilation, are important to minimize the risk of fire or explosion in areas where these gases are present.