Meteorology
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Regulations#1. The ratio in % between the amount of water vapour present in air to the amount of water vapour that it can hold at the same temperature is
Humidity is the weight of water vapor per unit volume of air. Absolute humidity is typically expressed in grams per cubic meter (g/m³).
Relative humidity is a term used to describe the amount of water vapor present in air compared to the maximum amount it can hold at the same temperature. Relative humidity is expressed as a percentage.
#2. The temperature to which air be cooled at constant pressure to become saturated, is called
It is the lowest temperature to which air can be cooled at constant pressure to become saturated with water vapor.
Cooling air below its dew point temperature causes condensation.
#3. Free air temperature, Wet bulb temperature and Dew point temperature are equal when
SATURATED air or relative humidity 100 %.
#4. On a rainy day compared to sunny day the length of runway required is
Engine performance is better on a dry day and also stop distance required on a rainy day after rejected take off would be more as friction is less.
#5. The spread (difference) between Free air temperature and Dew point temperature is _____ when the air is saturated
In saturated air, Free air temperature = dew point temperature.
#6. The saturation vapour pressure over water is _____ than the ice
At subzero temperatures water molecules have more energy and greater freedom than ice.
#7. As the temperature of the air increases, the amount of water vapour required to saturate it
At subzero temperatures water molecules have more energy and greater freedom than ice, as in when the temperature increases water molecules have less energy hence more water vapour required.
#8. The actual amount of water vapour contained in a given volume of air at a given temperature is termed as
Absolute Humidity is the weight of water vapour in unit volume of air. Absolute Humidity is usually expressed in gm/m3. Relative Humidity is a term used to describe the quantity of water vapour that exists in a gaseous mixture of air and water. Relative humidity is expressed as a percentage.
#9. Humidity mixing Ratio _____ when air is lifted adiabatically
Humidity mixing ratio is defined as mass of water vapour in a given mass of air. There is no addition or removal of water vapour in an adiabatic process. Hence it is constant.
#10. It is the lowest temperature which air would attain by evaporating water into it to saturate it.
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