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## Sea Words

### Alternating current (AC)

An electrical current that periodically reverses its direction. Standard in US and Canada is 60 cycles per second. Europe and other countries is 50 cycles per second.

### Alternative Rates

Privilege to use the rate producing the lowest charge.

### Altitude

The angle a celestial body makes with the horizon.

### Altitude

The elevation of a compressor above sea level.

### Amagat's law

States that the volume of a mixture of gases is equal to the sum of the partial volumes which the constituent gases would occupy if each existed alone at the total pressure of the mixture.

### Amain

An old maritime expression meaning "immediately", as "let go amain" (drop the anchor at once!).

### Amas

The outboard hulls of a trimaran.

### Ambient

Undisturbed environmental surroundings, particularly to air and temperature.

### American Bureau of Shipping

U.S. classification society which certifies seagoing vessels for compliance to standardized rules regarding construction and maintenance.

### AMIDSHIPS

Generally speaking the word amidships means in the middle portion of a vessel.

### Amidships

In or towards the middle of a ship in regard to length or breadth (center of).

### Ammeter

An instrument for measuring electrical current in amperes.

### Ammonia

A colorless gaseous compound of nitrogen and hydrogen used in refrigeration and in making of fertilizers and explosives. Found in some ambient air conditions.

### Amonton's law

States that the pressure of a gas, at constant volume, varies directly with the absolute temperature.

### AMP

ACRONYM - A unit of electrical current or rate of flow of electrons through a conductor. One volt across one ohm of resistance causes a current flow of one ampere. One ampere is equal to 6.25 x 1018 electrons per second passing a set point in a circuit. A ...

### Ampere (AMP)

A unit of electrical current or rate of flow of electrons through a conductor. One volt across one ohm of resistance causes a current flow of one ampere. One ampere is equal to 6.25 x 1018 electrons per second passing a set point in a circuit.

### Amplitude

In navigation, the angle between the point at which the sun rises and sets and the true east and west points of the horizon.

### AMS

The U.S. Customs' "Automated Manifest System."

### ANCHOR

The machine by which, when dropped to the bottom, the vessel is held fast.