# FREE-FLIGHT TRAJECTORY

 The path of a body in free fall.

## Related Terms

### POHLE AIR LIFT PUMP

A pistonless pump in which compressed air fills the annular space surrounding the uptake pipe and is free to enter the rising column at all points of its pressure but sometimes welded or bonded.

### PLANCK FUNCTION

The negative of the Gibbs free energy divided by the absolute temperature.

### PISTON CORER

A steel tube which is driven into the sediment by a free fall and by lead attached to the upper end, and which is capable of recovering undistorted vertical sections of sediment.

### PILOT TUNNEL

A small tunnel or shaft excavated in advance of the main drivage in mining and tunnel building to gain information about the ground, create a free face, and thus simplify the blasting operations.

### NERNST HEAT THEOREM

The theorem expressing that the rate of change of free energy of a homogeneous system with temperature, and also the rate of change of enthalpy with temperature, approaches zero as the temperature approaches absolute zero.

### MASSIEU FUNCTION

The negative of the Helmholtz free energy divided by the temperature.

### J FACTOR

A dimensionless equation used for the calculation of free convection heat transmission through fluid films.

Tube-and-shell heat exchanger in which the tube sheet (support for tubes) at one end of the tube bundle is free to move.

### INTEGRATING WATER SAMPLER

A water sampling device comprising a cylinder with a free piston whose movement is regulated by the evacuation of a charge of fresh water.

### IC SEE INTEGRATED CIRCUIT.ICE-ACCRETION INDICATOR

An instrument used to detect the occurrence of freezing precipitation, usually consisting of a strip of sheet aluminum about 11/2 inches (4 centimeters) wide, and is exposed horizontally, face up, in the free air a few meters above the ground.

### Related questions

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