Relative humidity is A) The temperature that air is saturated with water
B) The measure of how full of water air is compared to how much it can hold
C) The measure of how much water vapor is in the air

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.