Question

review questions
part a

1. a student measured the air temperature and the dew point in the morning and in the afternoon of the same day. the temperature stayed the same but the dew point rose. how was the weather changing on that day?

(1) cloud cover was decreasing.
(2) the temperature was increasing.
(3) the relative humidity was increasing.
(4) the relative humidity was decreasing.

1. which choice best explains how wind can be a form of heat flow by convection?

(1) the wind blows faster when the pressure gradient is high.
(2) wind is capable of moving sediment in sand dunes.
(3) movement of air can transport heated particles.
(4) strong winds are used to push sailboats.

Explanation:

1. For question 1: Relative humidity depends on air temperature and dew point. When temperature is constant, a rising dew point means the air can hold less excess moisture, so relative humidity increases.
2. For question 2: Convection is heat transfer by movement of a fluid (air here). Wind moving heated air particles directly transfers heat via this mechanism; other options do not relate to heat flow by convection.

Answer:

1. (3) The relative humidity was increasing.
2. (3) Movement of air can transport heated particles.