process for achieving, verify­ing, and documenting the performance of buildings to meet the operational needs of the building within the capabilities of the design and to meet the design documentation and the owner’s functional criteria, including preparation of operator personnel.

qualified person, company, or agency that plans and carries out the overall commissioning process 

overall document, usually prepared by the commissioning authority, which outlines the organization, schedul­ing, allocation of resources, documentation, etc., pertaining to the overall commissioning process 

energy management system in which a computer is the central controll­ing device.

act of complying with the rules or requirements of a standard 

1. relative variation of the departure from the perfect gas laws.

2. ease with which a fluid may be reduced in volume by the application of pressure. It depends on the state of the fluid as well as the type of the fluid itself.

process by which the pressure of a gas is in­creased by reducing its volume 

ratio of the absolute pressure after compression to the absolute pressure before compression.

each part at compression where­by the total compression of a gas is accomplished by several compressors in series to reduce the compression ratio for each stage.