# ANGLE EQUATION

A condition equation which expresses the relationship between the sum of the measured angles of a closed figure and the theoretical value of that sum, the unknowns being the corrections to the observed directions or angles, depending on which are used in the adjustment. Also known as triangle equation.

## Related Terms

### PLENUM CHAMBER

An enclosed space in which a plenum condition exists; air is forced into it for slow distribution through ducts.

### OVERCURING

A condition resulting from vulcanizing longer than necessary to achieve full development of physical strength; causes softness or brittleness and impaired ageresisting quality of the material.

### OFF-LINE

1. A condition existing when the drive rod of the drill swivel head is not centered and parallel with the borehole being drilled. 2. A borehole that has deviated from its intended course. 3. A condition existing wherein any linear excavation (shaft, drift, borehole) deviates from a previously determined or intended survey line or course. 4. State in which an equipment or subsystem is in standby, maintenance, or mode of operation other than online.

### MONITOR

1. An instrument used to measure continuously or at intervals a condition that must be kept within prescribed limits, such as radioactivity at some point in a nuclear reactor, a variable quantity in an automatic process control system, the transmissions in a communication channel or bank, or the position of an aircraft in flight. 2. To use meters or special techniques to measure such a condition. 3. A person who watches a monitor.

### LIMIT STATE

The condition beyond which a structure or a structural member is deemed unsafe due to one or more loads or load effects.

### ISOTHERMAL EQUILIBRIUM

The condition in which two or more systems are at the same temperature, so that no heat flows between them.

### IRREVERSIBLE ENERGY LOSS

Energy transformation process in which the resultant condition lacks the driving potential needed to reverse the process; the measure of this loss is expressed by the entropy increase of the system.

### INTERMITTENT OPERATION

Condition in which a device operates normally for a time, then becomes defective for a time.

### HYDROSTATIC STRESS

The condition in which there are equal compressive stresses or equal tensile stresses in all directions, and no shearstressesonanyplane.

### ANAEROBIC

A condition in which 'free' or dissolved oxygen is not present in the water.

### Related questions

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