Sensitive instruments are devices designed to detect and measure small changes in physical quantities, such as temperature, pressure, or light. These instruments are crucial in various fields, including science, medicine, and engineering, where precise measurements are essential for accurate results. For example, a thermometer can measure slight temperature variations, while a barometer can detect minor changes in atmospheric pressure. The sensitivity of these instruments allows them to pick up subtle signals that might be missed by less precise tools. This capability is vital for applications like environmental monitoring and laboratory experiments, where even tiny fluctuations can provide important insights into complex systems.