On the other tack.

The order to tack the ship

On the deck (not over it - see ALOFT)

Above decks; without concealment of deceit (out in the open).

To lay the head yards abox in a square rigged sailing vessel was to lay them square to the foremast in order to heave-to.

Abeam of (alongside of).

Alongside of. Side by side. Side by side ; by the side of.

American Bureau of Shipping. US Classification Society founded in 1862.

An arbitrary filter efficiency rating.

In a system of moist air, the ratio of the mass of water vapor to the total volume of the system. Usually expressed as grams per cubic meter (g/m3).

An instrument whose calibration can be determined by means of simple physical measurements on the instrument. Compare to secondary instrument.

All (not just 98%) particles larger than the stated micron size have been removed from the fluid being filtered.

The total pressure measured from absolute zero ( i.e., from an absolute vacuum).

The temperature of a body referred to the absolute zero, at which point the volume of an ideal gas theoretically becomes zero. (Fahrenheit scale is minus 459.67

Temperature based on an absolute scale.

A temperature scale based on absolute zero. Same as Kelvin temperature scale.

Is the force in newton required to move a fluid layer of one square meter area and a thickness of one meter with a velocity of one meter per second.

A hypothetical temperature characterized by a complete absence of heat and defined as 0 K, -273.15 C, or -459.67 F.

A method to trap liquids or gases by causing them to penetrate into the absorbent material.

A material that extracts one or more substances from a fluid (gas or liquid) medium on contact, and which changes physically and/or chemically in the process. The less volatile of the two working fluids in an absorption cooling device.