Question

1. when you look out the window, you can see constantly moving air. air is cycled in order to reach equilibrium. (18 points)

a. what are the two major characteristics that change when air is heated and cooled? (2 points)
b. how do these characteristics change the movement of air? (6 points)
c. what is the name of the cycle that develops during these changes? (2 points)
d. draw a diagram to illustrate this process. (4 points)
e. why do the changes you described in part b provide an example of a cycle? (4 points)

Explanation:

A. When air is heated or cooled, its density and temperature change. Heating causes temperature to rise and density to decrease; cooling has the opposite effect.
B. Less - dense (heated) air rises as it is lighter, and denser (cooled) air sinks. This creates a vertical movement of air. Horizontally, air moves from high - pressure (cool, dense) areas to low - pressure (warm, less - dense) areas.
C. The cycle is called a convection cycle.
D. A simple diagram could show a box representing a volume of air. At the bottom, a heat source is shown. Air near the heat source is labeled as warm and rising. At the top, air is labeled as cool and sinking. Arrows indicate the direction of air movement, creating a circular pattern.
E. The changes form a cycle because the heated air rises, cools at higher altitudes, sinks back down, gets heated again, and the process repeats continuously.

Answer:

A. Temperature and density.
B. Heated (less - dense) air rises, cooled (dense) air sinks; horizontally, air moves from high - pressure to low - pressure areas.
C. Convection cycle.
D. (Diagram description as above).
E. The process repeats continuously as heated air rises, cools, sinks, and gets heated again.