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That point at which the difference between the liquid and vapor states for water completely disappears.



Related Terms

CAVITATION

Formation of an air or vapor pocket (or bubble) due to lowering of pressure in a liquid, often as a result of a solid body, such as a propeller or piston, moving through the liquid; also, the pitting or wearing away of a solid surface as a result of the collapse of a vapor bubble. Cavitation can occur in a hydraulic system as a result of low fluid levels that draw air into the system, producing tiny bubbles that expand explosively at the pump outlet, causing metal erosion and eventual pump destruction.

BERTHELOT METHOD

A method of measuring the latent heat of vaporization of a liquid that involves determining the temperature rise of a water bath that encloses a tube in which a given amount of vapor is condensed.

BOILING TEMPERATURE

The temperature at which a liquid boils. As the boiling temperature rises with an increase in pressure (see saturated vapor pressure), the boiling temperatures are usually given for atmospheric pressure. At this pressure, water boils at +100° C., butane at - 0.5° C., ammonia at - 33° C. and propane at - 43° C.

CAVITATION

Formation of an air or vapor pocket (or bubble) due to lowering of pressure in a liquid, often as a result of a solid body, such as a propeller or piston, moving through the liquid; also, the pitting or wearing away of a solid surface as a result of the collapse of a vapor bubble. Cavitation can occur in a hydraulic system as a result of low fluid levels that draw air into the system, producing tiny bubbles that expand explosively at the pump outlet, causing metal erosion and eventual pump destruction.

FLUID

A substance readily assuming the shape of the container in which it is placed; e.g. oil, gas, water or mixtures of these. A general classification including liquids and gases.

CONDENSER TUBES

Metal tubes used in a heat-transfer device, with condenser vapor as the heat source and flowing liquid such as water as the receiver.

VACUUM SEPARATOR

A separator that utilizes subatmospheric pressure to remove certain gases and liquids from another liquid because of their difference in vapor pressure.

ATMOSPHERE

Is the mixture of gases and water vapor surrounding the earth.

BERNOULLI’S PRINCIPAL

When over the velocity (speed) of a liquid is increase at any point the pressure will decrease at that point.

LIQUID-IN-GLASS THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a graduated glass envelope; the indication of such a thermometer depends upon the difference between the coefficients of thermal expansion of the liquid and the glass; mercury and alcohol are liquids commonly used in meteorological thermometers.

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