#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
Relative humidity is defined as the ratio of actual water vapor content to the maximum possible at that temperature, expressed in percentage.
#2. The temperature to which air be cooled at constant pressure to become saturated, is called
Dew point is the temperature at which air becomes saturated (100% relative humidity) at constant pressure and water vapor starts to condense.
#3. Free air temperature, Wet bulb temperature and Dew point temperature are equal when
When relative humidity is 100%, the air is fully saturated, causing the dry bulb, wet bulb, and dew point temperatures to coincide.
#4. On a rainy day compared to sunny day the length of runway required is
Wet or rainy runways reduce friction, so an aircraft requires a longer distance to safely take off or land compared to a dry sunny day.
#5. The spread (difference) between Free air temperature and Dew point temperature is _____ when the air is saturated
When air is saturated, the dew point equals the air temperature, so the spread (difference) is minimal or least.
#6. The saturation vapour pressure over water is _____ than the ice
Water has higher vapor pressure than ice at the same temperature, meaning more molecules escape into the air (higher saturation vapor pressure).
#7. As the temperature of the air increases, the amount of water vapour required to saturate it
Warm air can hold more water vapor before reaching saturation; hence the saturation mixing ratio increases with temperature.
#8. The actual amount of water vapour contained in a given volume of air at a given temperature is termed as
Absolute humidity measures the mass of water vapor present per unit volume of air, independent of temperature or saturation.
#9. Humidity mixing Ratio _____ when air is lifted adiabatically
During adiabatic lifting, the total water vapor content of a parcel remains constant; only the relative humidity changes as temperature drops.
#10. It is the lowest temperature which air would attain by evaporating water into it to saturate it.
Wet bulb temperature is measured using a thermometer with a wet wick; it shows the lowest temperature achievable by evaporative cooling to reach saturation.
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