AC

AC, A.C. or Ac may refer to:

Computing

Entertainment

Assassin's Creed

Assassin's Creed is an action-adventure video game series that consists of nine main games and a number of supporting materials, as of 2015. The games have appeared on the PlayStation 3, PlayStation 4, Xbox 360, Xbox One, Microsoft Windows, Mac OS X, Nintendo DS, PlayStation Portable, PlayStation Vita, iOS, HP webOS,Android, Nokia Symbian Windows Phone platforms, and the Wii U.

The games are set in a fictional history of real world events and follows the centuries-old struggle between the Assassins, who fight for peace with free will, and the Templars, who desire peace through control. The main games in the franchise were developed by Ubisoft Montreal for the single player and Ubisoft Annecy for the multiplayer, with the handheld titles developed by Gameloft and Gryptonite Studios, with additional development by Ubisoft Montreal. The series has been well received by the public and critics, and has sold over 73 million copies as of April 2014, becoming Ubisoft's best selling franchise. The series took inspiration from the novel Alamut by the Slovenian writer Vladimir Bartol, while building upon concepts from the Prince of Persia series.

Plastic bottle

A plastic bottle is a bottle constructed from plastic. Plastic bottles are typically used to store liquids such as water, soft drinks, motor oil, cooking oil, medicine, shampoo, milk, and ink. The size ranges from very small sample bottles to large carboys.

History

Plastic bottles were first used commercially in 1947, but remained relatively expensive until the early 1960s when high-density polyethylene was introduced. They quickly became popular with both manufacturers and customers due to their lightweight nature and relatively low production and transportation costs compared with glass bottles. However, the biggest advantage plastic bottles have over glass, is their superior resistance to breakage, in both production and transportation. Except for wine and beer, the food industry has almost completely replaced glass with plastic bottles.

Production

Plastic bottles are formed using a variety of techniques. The choice of material varies depending upon application.

Assassin's Creed Unity

Assassin's Creed Unity is a 2014 action-adventure video game developed by Ubisoft Montreal and published by Ubisoft. It was released in November 2014 for Microsoft Windows, PlayStation 4 and Xbox One. It is the eighth major installment in the Assassin's Creed series, and the successor to 2013's Assassin's Creed IV: Black Flag. It also has ties to Assassin's Creed Rogue which was released for the previous generation consoles the PlayStation 3 and Xbox 360 on the same date.

The plot is set in a fictional history of real world events and follows the centuries-old struggle between the Assassins, who fight for peace with free will, and the Templars, who desire peace through control. The story is set in Paris during the French Revolution, the single-player story follows Arno Dorian in his efforts to expose the true powers behind the Revolution. The game retains the series' third-person open world exploration as well as introducing a revamped combat, parkour and stealth system. The game also introduces cooperative multiplayer to the Assassin's Creed series, letting up to four players engage in narrative-driven missions and explore the open-world map.

Air conditioning

Air conditioning (often referred to as A/C or AC) is the process of altering the properties of air (primarily temperature and humidity) to more comfortable conditions, typically with the aim of distributing the conditioned air to an occupied space such as a building or a vehicle to improve thermal comfort and indoor air quality. In common use, an air conditioner is a device that lowers the air temperature. The cooling is typically achieved through a refrigeration cycle, but sometimes evaporation or free cooling is used. Air conditioning systems can also be made based on desiccants.

In the most general sense, air conditioning can refer to any form of technology that modifies the condition of air (heating, cooling, (de-)humidification, cleaning, ventilation, or air movement). However, in construction, such a complete system of heating, ventilation, and air conditioning is referred to as heating, ventilation, and air conditioning (HVAC -as opposed to AC).

History

The basic concept behind air conditioning is said to have been applied in ancient Egypt, where reeds were hung in windows and were moistened with trickling water. The evaporation of water cooled the air blowing through the window. This process also made the air more humid, which can be beneficial in a dry desert climate. In Ancient Rome, water from aqueducts was circulated through the walls of certain houses to cool them. Other techniques in medieval Persia involved the use of cisterns and wind towers to cool buildings during the hot season.