# ANGULAR DISTANCE

1. The angular difference between two directions, numerically equal to the angle between two lines extending in the given directions. 2. The arc of the great circle joining two points, expressed in angular units. 3. Distance between two points, expressed in angular units of a specified frequency. It is equal to th

## Related Terms

A means of changing the difference between the control cut-in and cut-out points.

### HIGH WATER INEQUALITY

The difference between the heights of the two high waters during a tidal day

### GRID MAGNETIC ANGLE

Angular difference in direction between grid north and magnetic north. It is measured east or west from grid north. Grid magnetic angle is sometimes called GRID VARIATION or GRIVATION.

### HELIOCENTRIC PARALLAX

The difference in the apparent direction or positions of a celestial body outside the solar system, as observed from the earth and sun. Also called STELLAR PARALLAX, ANNUAL PARALLAX

### DIFFERENTIAL PRESSURE INDICATOR

An indicator which signals the difference in pressure between any two points of a system or a component.

### SHEAR RATE

The difference between the velocities along the parallel faces of a fluid element divided by the distance between the faces.

### DIFFERENTIAL PRESSURE INDICATOR

An indicator which signals the difference in pressure between two points, typically between the upstream and downstream sides of a filter element.

### COALESCOR

A separator that divides a mixture or emulsion of two immiscible liquids using the interfacial tension between the two liquids and the difference in wetting of the two liquids on a particular porous medium.

### PRESSURE DROP

Resistance to flow created by the element (media) in a filter or other equipment. Defined as the difference in pressure upstream (inlet side of the unit) and downstream (outlet side of the unit).

### HYDRAULIC CURRENT

A current in a channel caused by a difference in the surface level at the two ends. Such a current may be expected in a strait connecting two bodies of water in which the tides differ in time or range. The current in the East River, N.Y., connecting Long Island Sound and New York Harbor, is an example.

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