# aviation weather ?s Plz anwerser?

28. Explain the difference between humidity and relative humidity.

29. Cite examples of how heat energy can be transformed and transferred.

30. Review the term standard lapse rate and solve the following problem: You are at the ocean

beach on a hot summer day and the thermometer registers 92° F. What would be the

temperature reading for the pilot directly above you flying at 8,000 feet?

31. The following examples involve atmospheric pressure. Give a brief explanation of each.

a. The doors on a new car will not close unless a window is partially open.

b. Your ears “pop” if you go up or down a mountain.

c. You usually make two holes in the top of a metal can in order to remove the liquid.

Relevance
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Lv 6

28.

"Humidity is the amount of water vapor in the air. Relative humidity is defined as the ratio of the partial pressure of water vapor in a parcel of air to the saturated vapor pressure of water vapor at a prescribed temperature." --http://en.wikipedia.org/wiki/Humidity

Take a one-gallon container. Fill it with two quarts of water. That's the "humidity". Two quarts is 50% of the amount of water the container can actually hold. That's "relative humidity". The reference to "saturated vapor pressure of water vapor at a prescribed temperature" simply means that as the temperature changes the amount of water vapor that can dissolve into the air also changes--warm air holds more than cooler air.

29. Cite examples of how heat energy can be transformed and transferred.

Transferred? What are the three heat-transference mechanisms? Transformed? No ideas.

30. Two questions: What is the standard lapse rate? What is it in English measurement?

Let T-lapse = Standard lapse rate per x-feet/x-meters

Let d = Change in height in feet/meters

Let T-start = Temperature in degrees Fahrenheit/Celsius at starting point

Let T-end = Final temperature in degrees Fahrenheit/Celsius

T-end = T-start - [d * T-lapse]

Plug in the numbers and wah-LAH! Zee temperature-ahm-bee-yahng.

31. How does air pressure affect anything? What happens to the pressure as the altitude changes?

The best way of looking at this is to think of a large room with several doors. There's a large crowd inside the room. Everyone is lined up and leaving the room (no pushing or shoving, just a very orderly exit) through one door. How easily can someone enter the room through that one door? Open a second door. Now how easily can they enter the room? If everyone uses both doors to leave, will the room empty at the same rate? Or will it empty faster? What if the only way one person can leave the room is if another person comes in first? Can they leave faster if the person coming in can only enter through the door everyone is coming out of, or can they leave faster if the people coming in enter through a different door?

I've given you some general explanations on the "why" of weather. Try looking at the problems again to figure out the specifics.