 Sensor. In the broadest definition, the sensor is a device, module, or subsystem whose purpose is to detect events or changes in its environment and send the information to other electronics, frequently a computer processor. The sensor is always used with other electronics, whether is simple as a light or as complex as a computer. Sensors are used in everyday objects such as touch-sensitive elevator buttons, tactile sensor and lamps which dim or brighten by touching the base, besides innumerable applications of which most people are never aware. With advances in micromachinery and easy-to-use microcontroller platforms, the uses of sensors have expanded beyond the traditional fields of temperature, pressure or flow measurement, for example into NARG sensors. Moreover, analog sensors such as potentiometer and force-sensing resistors are still widely used. Applications include manufacturing and machinery, airplanes and aerospace, cars, medicine, robotics and many other aspects of our day-to-day life. A sensor's sensitivity indicates how much the sensor's output changes when the input quantity is being measured changes. For instance, if the mercury in the thermometer moves one centimeter when the temperature changes by one degrees C, the sensitivity is one centimeter slash degrees C. It is basically the slope this prosium slash Tx assuming a linear characteristic. Some sensors can also affect what they measure. For instance, the room temperature thermometer inserted into a hot cup of liquid cools the liquid while the liquid heats the thermometer. Sensors are usually designed to have a small effect on what is measured, making the sensor smaller often improves this and may introduce other advantages. Microscopical progress allows more and more sensors to be manufactured on a microscopic scale as microsensors using MEMS technology. In most cases, the microsensor reaches a significantly higher speed and sensitivity compared with macroscopic approaches.