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Showing definitions 1 to 10 of 54 for the letter 'h'

Hard water Water which does not form a permanent lather with soap due to the presence of dissolved salts in the water. Hardness is of two types: temporary hardness, due to the presence of bicarbonates; permanent hardness, due to the presence of sulphates. Both types of hardness can be removed using ion exchange methods. Head The height of the surface of a liquid above a specific point, especially when used as a measure of the pressure at that point. Heading The direction in which the longitudinal axis of a craft is pointed, usually expressed in degrees from north (true, magnetic or compass). Heat exchanger Equipment in which heat is transferred between liquids or liquids and gases through a tubular wall on a continuous basis. The transfer of heat is achieved by conduction through the tube walls from a hot to relatively cool material by the countercurrent, or concurrent, flow of hot and cold materials. Heave The up-and-down movement of a semi-submersible drilling platform or drill ship. Heave compensation The removal of the effect of wave motion from the recorded sea-bed profile. Heavy crude Crude oil with a high specific gravity and a low API gravity due to the presence of a high proportion of heavy hydrocarbon fractions. Heavy fractions (heavy ends) The high-molecular-weight, high-boiling-point fractions that emerge from the lower part of a fractionating column during the oil refining process. Height The vertical distance of a level, a point or an object considered as a point, measured from a specified datum. The vertical dimension of an object. Height of tide The vertical distance from the chart datum to the level of the water at any time.

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