pt2

Define Sublimation and Deposition

Sublimation: solid transfers directly into gas, skipping the liquid stage

Deposition: gas skips the liquid stage and turns into solid

Define evaporation and condensation

evaporation - liquid to gas

condensation - gas to liquid

What is dewpoint?

Dewpoint is the temperature to which air must be cooled to become saturated by the water vapor already present in the air. Achieves 100% relative humidity.

One weather phenomenon which will always occur when flying across a front is a change in the?

wind direction

NOT: stability in the air mass or types of precipitation

What measurement can be used to determine the stability of the atmosphere?

Actual lapse rate - The difference between the existing lapse rate of a given mass of air and the adiabatic rates of cooling in upward-moving air determines if the air is stable.

Steady precipitation preceding a front is an indication of

stratiform clouds with little or no turbulence

How to read density altitude chart

on the chart find the current altimeter setting and read the conversion factor

subtract or add based the conversion factor to the elevation

follow the “invisible” line for the corrected elevation and temperature

where these two points intercept is your density altitude

understanding chart supplement

Conditions that affect take off and landing

humidity (displaces air & fuel in the cylinder, % water vapor in the atmosphere, reduces power output)

surface wind conditions (headwind, tailwind, crosswind),

runway conditions (dry or wet surface, runway slope, pavement or turf)

preflight must be aware of

runway - calculate take off performance, length, obstacles, consider density altitude

altitude above you - select safe altitudes, know power settings for climb cruise, descent

fuel - understand the fuel system, compacity, burn rate, consider winds aloft

gross weight is in limits

crosswinds

What effect does high density altitude, as

compared to low density altitude, have on

propeller efficiency and why?

High temperature, high relative humidity, and high

density altitude.