For air to be saturated air it must contain the maximum amount of water vapor it can hold at a particular temperature. Relative humidity is the amount of water vapor in the air and to be fully saturated must be 100%.
the definition of 'standard air' includes the answer: 50%. See below
Air having a density of 0.075 lb per cu ft (0.0012 gm per cu cm) which approximates air at 68°F (20.0°C) dry bulb and 50% relative humidity at a barometric pressure of 29.9 in. (76.0 cm) of Mercury, or approximating dry air at 70°F (21.1°C) at the same pressure.
When a parcel of air is saturated with water vapor the relative humidity of that parcel of air is 100%.
100
wilson
75\
dew point
dew point
Saturated air is more dense.
Lungs alveoli has very large surface area, about 100 square meters. So air is fully saturated with water vapor and so it is more in amount.
"Saturated" or "At saturation point".
dew point
dew point
dew point
dew point
dew point
Saturated air is air that has all the water vapor that it can hold.
Saturated air is air that has all the water vapor that it can hold.
Saturated air is more dense.
When a parcel of air is saturated with water vapor the relative humidity of that parcel of air is 100%.
more air
100%
more air