A psychrometer measures
1. wet bulb temperature
2. dry bulb temperature
3. dew point temperature
Which of these points are valid?
If Pa and Pv denote respectively the partial pressure of dry air and that of water vapour in moist air, the specific humidity of air is given by
Assuming that the dry air and water vapour behaves as perfect gases, we have for dry
For water vapour
Ra = 0.287 kJ/kgK (for dry air)
Rv = 0.461 kJ/kgK (for water vapour)
The mass of water vapour in one m3 of dry air is 'defined as
Mass of water vapour present per m3 of dry air is called absolute humidity.
Indication of amount of moisture in air is given by
The temperature measured by wick-covered bulb of a thermometer is called wet bulb temperature.
Such a thermometer or WBT indicates the temperature of liquid water in the wick.
What is the saturation temperature at the partial pressure of water vapour in the air water-vapour mixture called
Dew point temperature is the temperature of air recorded by a thermometer, when the moisture (water vapour) present in it begins condense.
In other words dew point temperature is the saturation temperature corresponding to the, partial pressure of water vapour.
Choose the correct alternative
Dry bulb temperature, wet bulb temperature and dew-point temperature are same for which one of the following
For saturated air, dry bulb temperature, wet bulb temperature and dew point temperature are same
Which of the following option is true for the dry bulb temperature (TDBT), the wet bulb temperature (TWBT) and dew point temperature (TDPT) for a mixture of air and water vapour
For a mixture of air and water vapour.
Degree of saturation or percentage humidity is
Degree of saturation is the ratio of actual specific humidity to the specific humidity under saturated condition.
For air at a given temperature as the relative humidity is increased isothermally
WBT and specific humidity increases