Chemical sensing is a research area that focuses on the development of technologies and methods for detecting and measuring the presence of specific chemical compounds in various environments. This field involves the use of different sensing technologies, such as gas sensors, biosensors, and chemical sensors, to detect and quantify the concentration of target molecules. Chemical sensing has a wide range of applications, including environmental monitoring, industrial process control, medical diagnostics, and food safety. Researchers in this area work on improving the selectivity, sensitivity, and reliability of chemical sensors to meet the specific needs of different industries and applications. Some of the key challenges in chemical sensing research include developing sensors that are highly selective, fast, and low-cost, as well as improving the integration of sensor technology with data processing and communication systems for real-time monitoring and analysis.