Pressure Flashcards
For every 1000 feet of altitude, pressure decreases by ____ in Hg.
1.00
What is MSLP?
It is the station pressure plus the weight of imaginary column of air between station pressure and the mean sea level, using the average temp for the past 12 hours.
What is altimeter setting?
The pressure that when set will cause altimeter to read station elevation when A/C is on the ground.
The altitude obtained from using the altimeter is called what?
Indicated altitude
When is altimeter setting used in Canada/ North America?
During take-off and landing and in flight in low-level airspace.
Also used for flight in high-level airspace in the Standard Pressure Region of Northern Canada at all altitudes.
Describe an Isobar
A line joining equal points of pressure (MSL) on a surface map.
Describe Station Pressure Falling
Low or trough approaching or high leaving the area
Bad WX on the way
Altimeter setting also falling
Describe Station Pressure Rising
High or ridge approaching area, or low leaving area.
Altimeter setting will be rising.
Describe Pressure Rising Rapidly
A strong high pressure system approaching, a high pressure system approaching rapidly, or a deep low pressure system leaving.
What is Pressure Tendency?
The rate of rise or fall of pressure at a particular location taken over time, typically 3 hours.
What is the Pressure Gradient Force?
Air moving from an area of high to low pressure. Strength dictated by spacing of isobars.
