When moist air is heated up,

Question

BlackTom AI · Accepted Answer

The question as given is incomplete because the answer options are not provided. Nevertheless, we can still reason about the statement that is shown as the answer: 'd. the absolute humidity does not change.'

To analyze this, recall definitions: absolute humidity is the mass of water vapor per unit volume of air. When moist air is heated at constant pressure, the amount of water vapor present (mass of water vapor) generally does not change unless water is added or removed. Heating the air causes the volume to expand, so the density of water vapor per unit volume can decrease, but the actual mass of water vapor in the mixture remains the same if no moisture is added.

Therefore, if no condensation or evaporation occurs and there is no exchange of moisture with the surroundings, the absolute humidity stays essentially the same, while other properties change: the relative humidity typically decreases because the air can hold more water vapor at higher temperatures, and the dew point may change differently.

Now, considering the other options would require seeing them, but hypothetically:
- A statement claiming a change in absolute humidity would imply that moisture content is added or removed during heating, which is not inherently implied by heating alone.
- A claim about relative humidity would be about how capacity changes with temperature, not about the amount of water vapor present.
- A statement focusing solely on temperature or pressure effects without mentioning moisture content would miss the core concept of absolute humidity remaining constant absent moisture transfer.

In summary, the reasoning supports the idea that, under heating at constant pressure with no moisture transfer, absolute humidity does not change. If other answer choices were available, we would compare them against this principle and explain why they are incorrect.

BH20A0720 Engineering Thermodynamics - Blended teaching 2.9.2024-15.12.2024 Quiz 8

When moist air is heated up,

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