ATMOSPHERIC PRESSURE AND ALTIMETRY Flashcards

1
Q

ATMOSPHERIC PRESSURE

A

THE FORCE PER UNIT ARE EXERTED BY THE WEIGHT OF THE ATMOSPHERE, AIR PRESSURE IS EXERTED IN ALL DIRECTIONS

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2
Q

BAROMETER

A

(TORRICELLI) INSTRUMENT USED TO MEASURE PRESSURE

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3
Q

ANEROID BAROMETER

A

PARTIAL VACUUM CREATED IN A METAL CELL, WHICH CONTRACT AND EXPANDS AS PRESSURE CHANGES

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4
Q

STATION PRESSURE

A

THE PRESSURE MEASURED AT AN AIRPORT

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5
Q

PRESSURE VARIATION

A

ATMOSPHERIC PRESSURE VARIES WITH ALTITUDE, TEMPERATURE, AND WATER VAPOR

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6
Q

TEMPERATURE EFFECT ON PRESSURE

A

AS TEMPERATURE INCREASES PRESSURE DECREASES

AS TEMPERATURE DECREASES PRESSURE INCREASES

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7
Q

SEA LEVEL PRESSURE ANALYSES (SURFACE CHART)

A

SHOWS LINES CONNECTING POINTS OF EQUAL PRESSURE (ISOBARS)

IDENTIFIES PRESSURE PATTERNS

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8
Q

CONSTANT PRESSURE SURFACE

A

A SURFACE ALONG WHICH THE ATMOSPHERIC PRESSURE IS EQUAL AT A GIVEN POINT

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9
Q

RAWINSONDE OBSERVERATIONS

A

UPPER AIR OBSERVATIONS INCLUDING PRESSURE, TEMPERATURE, RELATIVE HUMIDITY AND WINDS ALOFT

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10
Q

CONSTATN PRESSURE SURFACE ANALYSIS

A

CHART CONNECTING POINTS OF EQUAL HEIGHT, CHARTS ARE SPECIFIC TO A CONSTANT MILLIBAR PRESSURE

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11
Q

ATMOSPHERIC DENSITY

A

RATIO OF MASS OF AIR TO THE VOLUME

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12
Q

VOLUME EFFECTS ON DENSITY

A

DENSITY AND VOLUME ARE INVERSELY RELATED

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13
Q

CHANGES IN AIR DENSITY

A

DENSITY IS EFFECTED BY MASS, PRESSURE, OR TEMPERATURE

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14
Q

DENSITY EFFECTS ON PRESSURE

A

DENSITY AND PRESSURE ARE DIRECTLY RELATED

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15
Q

TEMPERATURE EFFECTS ON DENSITY

A

DENSITY AND TEMPERATURE ARE INVERSELY RELATED

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16
Q

WATER VAPOR EFFECTS ON DENSITY

A

DENSITY AND WATER VAPOR ARE INVERSELY RELATED

17
Q

ALTIMETRY

A

ESSENTIALLY A BAROMETER READING IN UNITS OF ALTITUDE RATHER THAN PRESSURE

18
Q

TRUE ALTITUDE

A

IS THE VERTICAL DISTANCE ABOVE MSL

19
Q

INDICATED ALTITUDE

A

SHOWS ALTITUDE AT PRESSURE RATHER THAN MEASURING HEIGHT ABOVE SEA LEVEL OR GROUND
COLD AIR: TRUE WOULD BE LOWER THAN INDICATED
WARM AIR: TRUE WOULD BE HIGHER THAN INDICATED

20
Q

PRESSURE ALTITUDE

A

IS ALTITUDE BASED ON THE STANDARD PRESSURE OF 29.92’ HG

21
Q

DENSITY ALTITUDE

A

IS PRESSURE ALTITUDE CORRECTED FOR NON STANDARD TEMPERATURE
IT IS INDIRECTLY RELATED TO ATMOSPHERIC DENSITY
HIGHER DENSITY ALTITUDE EQUALS WORSE PERFORMANCE