If a sample of air contains 1 g/kg of water vapor and has a relative humidity of 25 percent at -5 degrees celsius how much water vapor does it need to contain to be saturated?
a) 2 g/kg
b) 1 g/kg
c) 4 g/kg
d) 3 g/kg

Option C

Explanation:

As we know that

Relative humidity (RH) is defined as the ratio of amount of water vapor present in a given sample of air to the maximum amount of water that can be  absorbed by the same sample of air to attain saturation  at a particular temperature .

Thus,

Where X represents the current amount of water vapor present in a given sample of air

and Y represents the maximum amount of water that can be  absorbed by the same sample of air to attain saturation  at a particular temperature

Substituting the given values in above equation we get -

Hence, option C is the correct answer

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.