From classical antiquity through the 19th century, science as a type of knowledge was more closely linked to philosophy than it is now, and in the Western world the term natural philosophy once encompassed fields of study that are today associated with science, such as astronomy, medicine, and physics.
Occupancy definition, the act, state, or condition of being or becoming a tenant or of living in or taking up quarters or space in or on something: Continued occupancy of the office depends on a rent reduction. See more.
An occupancy sensor is a lighting control device that detects occupancy of a space by people and turns the lights on or off automatically, using infrared, ultrasonic or microwave technology. Occupancy sensors are typically used to save energy, provide automatic control, and comply with building codes. Three basics types of occupancy sensors are: 1  Passive infrared sensor, which works on heat movement detection.