Work (thermodynamics) of the energy went out as heat, and how much as work. This can be summarized by saying that heat and work are not state functions of the system. This is in contrast to classical mechanics, where net work exerted by a particle is a state function. Pressure–volume work (or "PV" work) occurs when the volume of a system changes. "PV" work is often measured in units of litre-atmospheres where = . However, the litre-atmosphere is not a recognised unit in the SI system of units, which measures P in Pascal (Pa), V in m, and PV in Joule (J),
Scientific Atlanta of home security and energy management during the 1970s. The company marketed wireless home alarm systems and provided equipment to utilities that enabled them to monitor home energy use. By the dawn of the 1980s, Scientific Atlanta had become the world's largest supplier of satellite earth stations. In February 2003, Scientific-Atlanta introduced their first Explorer HD set-top box, which is capable of displaying HDTV programming, at Best Buy stores in the Phoenix metropolitan area. It was later rolled out nationwide. In March 2004, Scientific-Atlanta launched the Explorer 8000HD, their first set-top box with both DVR and HD. In the set-top