Question 1338Navigation General

70% to pass

The expression "the air is saturated" means _______________.

A the vapor pressure is at its minimum for the prevailing temperature
B the relative humidity is 100%
C precipitation has commenced
D cloud cover is 100%
AI Explanation

The correct answer is B) the relative humidity is 100%. When the air is saturated, it means the water vapor content in the air has reached its maximum capacity at the prevailing temperature. At 100% relative humidity, the air cannot hold any more water vapor, and the vapor pressure is at its maximum for that temperature. This is the definition of "the air is saturated". The other options are incorrect because: A) the vapor pressure being at its minimum is not the definition of saturation; C) precipitation has not necessarily commenced just because the air is saturated; and D) 100% cloud cover does not necessarily mean the air is saturated.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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