GRG T4 (3-5) Air Pressure Intro

Air Pressure

The weight of the air above us.

Decreases

As height increases, air pressure always ____.

Grow

Heating a column of air causes it to ____.

Shrink

Cooling a column of air causes it to ____.

Surface Pressure

It takes a shorter column of cold dense air to exert the same _____ _____ as a taller column of warm less dense air.

Colder

Atmospheric pressure decreases more rapidly with height in a _____ column of air.

Warmer

Atmospheric pressure decreases more slowly with height in a _____ column of air.

Stable

Warmer air and higher atmospheric pressure aloft.

Unstable

Colder air and lower atmospheric pressure aloft.

Pressure

Horizontal temperature differences result in a horizontal difference in _____.

Mercurial Type

Barometer that uses mercury in a glass tube.

Aneroid

Accordion-like barometer that expands/contracts an airtight parcel.

Altimeters

Type of Aneroid Baromter used in cockpits; measures altitude.

Temp, Instrument, Gravity, Sea Level

Barometer Corrections (4)

Instrument Corrections

Corrections for ONLY Mercurial Types.

Station Pressure

Raw pressure reading before corrections.

1in/hg

Atmospheric pressure decreases _____ for every 1000ft rise in altitude.