Question

fill in the blank question
air over a warm surface can be heated by the process of

. this heated air rises because it is less

than the surrounding air. the process, which can take place over large areas for days or weeks, results in the formation of an air

.
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Explanation:

• Conduction: When air is in contact with a warm surface, heat is transferred from the surface to the air molecules through direct molecular collisions. This is the process of conduction.
• Dense: According to the ideal gas law \(PV = nRT\) (where \(P\) is pressure, \(V\) is volume, \(n\) is the number of moles, \(R\) is the gas constant, and \(T\) is temperature), when air is heated (increase in \(T\)), at constant pressure (\(P\)), its volume (\(V\)) increases. Density \(

ho=\frac{m}{V}\) (where \(m\) is mass). Since \(m\) is approximately constant for a given amount of air (neglecting small mass changes due to expansion - contraction effects like water vapor changes which are secondary here), an increase in \(V\) leads to a decrease in \(
ho\). So, heated air is less dense than surrounding air.

• Mass: When air is heated over a large area for an extended period (days or weeks), the large - scale movement and accumulation of this less - dense, heated air forms an air mass. Air masses have relatively uniform temperature and humidity characteristics.

Answer:

1. conduction
2. dense
3. mass