A chemical agent is a substance that can cause harm to living organisms or the environment through chemical reactions. These agents can be found in various forms, including gases, liquids, or solids, and are often used in military applications, pest control, or industrial processes. Examples include nerve agents, mustard gas, and pesticides. Chemical agents can disrupt biological functions by interfering with cellular processes or damaging tissues. Their effects can range from mild irritation to severe health issues or death, depending on the type and concentration of the agent. Understanding these substances is crucial for safety and regulatory measures in both civilian and military contexts.