Question 1337Navigation General

The correct answer is B) a specific temperature. Relative humidity is the percentage of water vapor that is in the air compared to the maximum amount of water vapor the air can hold at a specific temperature. This is because the maximum amount of water vapor the air can hold is dependent on the air temperature - warmer air can hold more water vapor than cooler air. Therefore, the relative humidity is measured in relation to the maximum water vapor capacity at a given temperature, not barometric pressure, wind speed, or any random time. The other options are incorrect because they do not accurately reflect the definition of relative humidity, which is specifically tied to the air's maximum water vapor capacity at a certain temperature.