Dry Day 1 - 30°C | Day 2 - 29°C | Day 3 - 25°CWet Day 1 - 22°C | Day 2 - 22°C | Day 3 - 21°CThe reading above are for three consecutive days from a wet and ...

Answer Details

The wet and dry bulb hygrometer is used to measure the relative humidity of the air. The dry bulb thermometer measures the actual temperature while the wet bulb thermometer is covered with a wet wick and measures the lowest temperature that can be achieved through evaporative cooling. The greater the difference between the two temperatures, the drier the air is. In the given readings, the dry bulb temperature decreases gradually from 30°C to 25°C while the wet bulb temperature remains constant at 22°C for all three days. This means that the difference between the dry and wet bulb temperatures is decreasing, indicating an increase in the relative humidity of the air over the three days. Therefore, the correct answer is "increased steadily."