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  1. The temperature above which a gas cannot be liquefied by pressure alone.
  2. The temperature at which the properties of a material begin to deteriorate.


Related Terms

CALLENDAR'S COMPENSATED AIR THERMOMETER

A type of constant-pressure gas thermometer in which errors resulting from temperature differences between the thermometer bulb and the connecting tubes and manometer used to maintain constant pressure are eliminated by the configuration of the connecting tubes.

MOLAR VOLUME

The volume occupied by one molecular mass in grams (g mole) under specific conditions. For an ideal gas at standard temperature and pressure it is 0.0224 m3/g mole.

BULB

The name given to the temperature-sensing device located in the fluid for which control or indication is provided. The bulb may be liquidfilled, gas filled, or gas-and-liquid filled. Changes in temperature produce pressure changes within the bulb which are transmitted to the controller.

JOULE-THOMSON COEFFICIENT

The ratio of the temperature change to the pressure change of a gas undergoing isenthalpic expansion.

COMPRESSIBILITY FACTOR

The product of the pressure and the volume of a gas, divided by the product of the temperature of the gas and the gas constant; this factor may be inserted in the ideal gas law to take into account the departure of true gases from ideal gas behavior. Also known as deviation factor; gas-deviation factor; supercompressibility factor.

CHARLES LAW

At constant pressure the volume of gas is directly proportional to its absolute temperature.

GAS VOLUME FRACTION (GVF)

The gas volume flow rate, relative to the multiphase volume flow rate, at the pressure and temperature prevailing in that section. The GVF is normally expressed as a percentage.

GAY-LUSSACS LAW

At constant pressure the volume of gas is directly proportional to its absolute temperature.

DEW-POINT CURVE

On a PVT phase diagram, the line that separates the two-phase (gas-liquid) region from the one-phase (gas) region, and indicates the point at a given gas temperature or pressure at which the first dew or liquidphaseoccurs.

NONCONDENSABLE GAS

Gas in a system that does not condense at the temperature and pressure at which it exists in the system.

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