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# CONSTANT OF MOTION

 A dynamical variable of a system which remains constant in time.

## Related Terms

### ASYNCHRONOUS TIMING

A simulation method for queues in which the system model is updated at each arrival or departure, resulting in the master clock being increased by a variable amount.

### DYNAMICAL VARIABLE

One of the quantities used to describe a system in classical mechanics, such as the coordinates of a particle, the components of its velocity, the momentum, or functions of these quantities.

### HEAT OF COOLING

Increase in enthalpy during cooling of a system at constant pressure, heat conductivity See thermal conductivity.

### OHM

A derived unit of electrical resistance in the International System of Units; it is the electrical resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in the conductor a current of 1 ampere, the conductor not being the seat of an electromotive force.

### TIME SCALE

A system of assigning dates to events. There are three fundamental scales: Ephemeris Time, time based upon the rotation of the earth, and atomic time or time obtained by counting the cycles of a signal in resonance with certain kinds of atoms. Ephemeris Time (ET), the independent variable in the gravitational theories of the solar system, is the scale used by astronomers as the tabular argument of the precise, fundamental ephemerides of the sun, moon, and planets. Universal Time (UT1), time based on the rotation of the earth, is the scale used by astronomers as the tabular argument for most other ephemerides, e.g., the Nautical Almanac. Although ET and UT1 differ in concept, both are determined in arrears from astronomical observations and are extrapolated into the future based on International Atomic Time (TAI). Coordinated Universal Time (UTC) is the scale disseminated by most broadcast time services; it differs from TAI by an integral number of seconds.

### AMPERE

The base unit of electric current in the International System of Units; it is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section

### HEAT CAPACITY

The quantity of heat required to raise a system one degree in temperature in a specified way, usually at constant pressure or constant volume. Also known as thermal capacity.

### VOLT

A derived unit of electric potential in the International System of Units, it is the difference of electric potential between two points of a conducting wire carrying a constant current of 1 ampere, when the power dissipated between these points is equal to 1 watt.

### CONSERVATIVE PROPERTY

A property of a system whose value remains constant during a series of events.

### ISOBARIC PROCESS

A thermodynamic process of a gas in which the heat transfer to or from the gaseous system causes a volume change at constant pressure.

### Related questions

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