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Eng ID | Term | Definition |
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4021 | preferred channel mark | A distinctive lateral mark used to indicate both the point at which a channel divides and the channel that has been designated as preferred ... more |
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4022 | preferred datum | A geodetic datum selected as a base for consolidation of local independent datums within a geographical area. Also called major datum. |
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4023 | preliminary survey | See SURVEY: RECONNAISSANCE. |
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4024 | press proof | A lithographed impression taken from among the first copies run on the press and used for checking purposes. Also called press pull. |
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4025 | pressure: atmospheric | Pressure (force per unit area) exerted by the ATMOSPHERE, on any surface, by virtue of its WEIGHT: it is numerically equal to the WEIGHT o... more |
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4026 | pressure: barometric | ATMOSPHERIC PRESSURE as indicated by a BAROMETER. |
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4027 | pressure: hydrostatic | The pressure at a given DEPTH due to the WEIGHT of the water column above that DEPTH. |
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4028 | pressure: sound | The instantaneous pressure at a point in a medium in the presence of a SOUND WAVE, minus the static pressure at that point. |
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4029 | pressure-altitude | An ATMOSPHERIC PRESSURE expressed in terms of ALTITUDE which corresponds to that pressure in the STANDARD ATMOSPHERE. |
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4030 | pressure gauge | See GAUGE. |
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4031 | pressure gradient | Vector, perpendicular to the isobaric line or surface, directed towards low pressure and of intensity equal to the rate of variation of th... more |
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4032 | pressure hydrophone | A HYDROPHONE in which the electric OUTPUT substantially corresponds to the instantaneous SOUND PRESSURE of the impressed SOUND WAVE. |
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4033 | pressure ice | A general term for FLOATING ICE which has been squeezed together and in places forced upwards, when it can also be described as RAFTED ICE... more |
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4034 | pressure plate | In PHOTOGRAPHY, a flat plate (usually of metal but frequently of glass or other substance) which, by means of mechanical force, presses fi... more |
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4035 | pressure ridge | A ridge or wall of HUMMOCKED ICE where one FLOE has been pressed against another. |
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4036 | pressure wave | A short-period oscillation of pressure such as that associated with the propagation of SOUND through the ATMOSPHERE; a type of LONGITUDINA... more |
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4037 | Price-Gurley current meter | A battery powered electromechanical CURRENT METER which measures current speed only. |
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4038 | pricker | A pointed tool used instead of a pencil for laying off finer and more accurate lines on a PLOTTING SHEET. |
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4039 | primary circle | See PRIMARY GREAT CIRCLE. |
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4040 | primary great circle | A GREAT CIRCLE used as the origin of measurement of a COORDINATE; particularly such a circle 90° from the POLES of a system of SPHERICAL ... more |