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When atmospheric air is heated at constant pressure its
1. Humidity ratio does not change
2. Relative humidity increases
3. Dew point temperature does not change
4. Web bulb temperature increases
1. Humidity ratio does not change
2. Relative humidity increases
3. Dew point temperature does not change
4. Web bulb temperature increases
Which one of the following is correc
- a)1 and 3
- b)1 and 2
- c)2 and 3
- d)3 and 4
Correct answer is option 'A'. Can you explain this answer?
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When atmospheric air is heated at constant pressure its1. Humidity rat...
Humidity ratio does not change
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When atmospheric air is heated at constant pressure its1. Humidity rat...
Heating of Atmospheric Air at Constant Pressure
When atmospheric air is heated at constant pressure, certain changes occur in its properties. Let's discuss each of these changes in detail.
1. Humidity Ratio Does Not Change
The humidity ratio of air is the mass of water vapor per unit mass of dry air. When air is heated at constant pressure, the mass of dry air remains constant. Therefore, the humidity ratio of air does not change.
2. Relative Humidity Increases
Relative humidity is the ratio of the partial pressure of water vapor in the air to the saturation pressure of water vapor at the same temperature. When air is heated at constant pressure, its saturation pressure increases. This means that the same partial pressure of water vapor corresponds to a lower relative humidity. Therefore, the relative humidity of air increases when it is heated at constant pressure.
3. Dew Point Temperature Does Not Change
The dew point temperature is the temperature at which the water vapor in the air begins to condense. When air is heated at constant pressure, the amount of water vapor in the air does not change. Therefore, the dew point temperature of air does not change when it is heated at constant pressure.
4. Wet Bulb Temperature Increases
The wet bulb temperature is the lowest temperature that can be achieved by evaporating water into the air. When air is heated at constant pressure, its ability to hold moisture increases. Therefore, the wet bulb temperature of air increases when it is heated at constant pressure.
Conclusion
When atmospheric air is heated at constant pressure, its humidity ratio does not change, its relative humidity increases, its dew point temperature does not change, and its wet bulb temperature increases.
When atmospheric air is heated at constant pressure, certain changes occur in its properties. Let's discuss each of these changes in detail.
1. Humidity Ratio Does Not Change
The humidity ratio of air is the mass of water vapor per unit mass of dry air. When air is heated at constant pressure, the mass of dry air remains constant. Therefore, the humidity ratio of air does not change.
2. Relative Humidity Increases
Relative humidity is the ratio of the partial pressure of water vapor in the air to the saturation pressure of water vapor at the same temperature. When air is heated at constant pressure, its saturation pressure increases. This means that the same partial pressure of water vapor corresponds to a lower relative humidity. Therefore, the relative humidity of air increases when it is heated at constant pressure.
3. Dew Point Temperature Does Not Change
The dew point temperature is the temperature at which the water vapor in the air begins to condense. When air is heated at constant pressure, the amount of water vapor in the air does not change. Therefore, the dew point temperature of air does not change when it is heated at constant pressure.
4. Wet Bulb Temperature Increases
The wet bulb temperature is the lowest temperature that can be achieved by evaporating water into the air. When air is heated at constant pressure, its ability to hold moisture increases. Therefore, the wet bulb temperature of air increases when it is heated at constant pressure.
Conclusion
When atmospheric air is heated at constant pressure, its humidity ratio does not change, its relative humidity increases, its dew point temperature does not change, and its wet bulb temperature increases.
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