Whois & Analysis for online-access.com

Heating, ventilation and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort.

Its goal is to provide thermal comfort and acceptable indoor air quality.

HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer.

Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).

Plumbing is any system that conveys fluids for a wide range of applications.

Plumbing uses pipes, valves, plumbing fixtures, tanks, and other apparatuses to convey fluids.

Heating and cooling (HVAC), waste removal, and potable water delivery are among the most common uses for plumbing, but it is not limited to these applications.

The word derives from the Latin for lead, plumbum, as the first effective pipes used in the Roman era were lead pipes.

E-commerce is a transaction of buying or selling online.

Electronic commerce draws on technologies such as mobile commerce, electronic funds transfer, supply chain management, Internet marketing, online transaction processing, electronic data interchange (EDI), inventory management systems, and automated data collection systems.

Modern electronic commerce typically uses the World Wide Web for at least one part of the transaction's life cycle although it may also use other technologies such as e-mail.

An electrician is a tradesperson specializing in electrical wiring of buildings, stationary machines, and related equipment.

Electricians may be employed in the installation of new electrical components or the maintenance and repair of existing electrical infrastructure.

Electricians may also specialize in wiring ships, airplanes, and other mobile platforms, as well as data and cable.

Social media are computer-mediated technologies that facilitate the creation and sharing of information, ideas, career interests and other forms of expression via virtual communities and networks.

The variety of stand-alone and built-in social media services currently available introduces challenges of definition; however, there are some common features: