A chemical sensor is a device that detects and measures specific chemical substances in the environment. It works by converting the chemical information into an electrical signal, which can then be analyzed. These sensors are widely used in various fields, including environmental monitoring, medical diagnostics, and industrial processes. Chemical sensors can identify gases, liquids, or even biological molecules. They often utilize materials like semiconductors or electrochemical cells to enhance sensitivity and selectivity. By providing real-time data, chemical sensors play a crucial role in ensuring safety and improving efficiency in numerous applications.