Final answer:
Temperature and pressure are two factors that affect air density.
Step-by-step explanation:
Two factors that affect air density are temperature and pressure. When temperature increases, air molecules move faster and spread out, resulting in a decrease in air density. Conversely, when temperature decreases, air molecules slow down and come closer together, leading to an increase in air density.
Pressure also affects air density. High-pressure systems have denser air because the weight of the air above pushes down on the lower layers, compressing them. In contrast, low-pressure systems have less dense air because the weight of the air above is less, allowing the air below to expand.
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