Which hazard class indicates the presence of liquids that can ignite easily?

The hazard class that indicates the presence of liquids that can ignite easily is flammable liquids. This category comprises liquids that have a flash point below 100 degrees Fahrenheit (37.8 degrees Celsius), meaning they can produce enough vapor to form an ignitable mixture with air at relatively low temperatures. Flammable liquids pose a significant risk in emergency situations because they can ignite from sparks, flames, or even static electricity, leading to fires and explosions.

In contrast, combustible liquids have a higher flash point and are generally less volatile than flammable liquids. Corrosive liquids can cause severe damage to living tissue or materials but do not necessarily ignite easily. Explosive liquids are substances that can rapidly decompose or react, producing gas and heat but are categorized differently based on their explosive properties rather than their flammability characteristics. Understanding these classifications is crucial for ensuring proper handling and response measures in hazardous material situations.