Question

As long as there is no addition or removal of water vapor, the relative humidity of unsaturated (clear) air rises as the air temperature falls. Hence, on a clear, calm day, the relative humidity is ______ near sunrise, the coldest time of day.

dewpoint
precipitation point
frost point

Answer 1

`\large\underline{\textsf{Background Information.}}`

`\textsf{In this scenario, there's a system that pushes down air from the atmosphere.}`

`\textsf{This air is usually dry, which resembles air you might see from a cold front,}`

`\textsf{however, since there are clear skies, this air warms up quickly due to the Sun.}`

`\large\underline{\textsf{Identifying the Best Option.}}`

`\textsf{From the options provided, we want to identify from the options provided what}`

`\textsf{the humidity is closest to.}`

`\large\underline{\textsf{What is Humidity?}}`

`\textsf{Humidity represents the percentage of water vapor in the air at a temperature.}`

`\textsf{Knowing what humidity is, we can say that the frost point is incorrect. Frost}`

`\textsf{point is the vapor pressure of water over a wet surface such as ice. Similar to}`

`\textsf{Dewpoint, it's also the vapor pressure of water however over a water surface.}`

`\textsf{Frost point is incorrect since we know nothing about the temperature outside}`

`\textsf{and precipitation point is incorrect since the conditions make it impossible for}`

`\textsf{any precipitation to form. It's also likely the`

`\textsf{up. Therefore, the correct answer is \boxed{\sf dewpoint.}}`

`\large\underline{\textsf{Alternate Question:}}`

`\textsf{As long as there is no addition or removal of water vapor, the relative humidity}`

`\textsf{of unsaturated (clear) air rises as the air temperature falls. Hence, on a clear,}`

`\textsf{calm day, the relative humidity is \boxed{\sf ?} near sunrise, the coldest time of the day.}`

`\underline{\textsf{Answer Choices:}}`

`\textsf{Highest.}`

`\textsf{Lowest.}`

`\textsf{As the temperature falls, the humidity increases as the temperature is getting}`

`\textsf{closer to the dewpoint. Hence, the answer is \boxed{\sf highest.}}`

`\Large\boxed{\textsf{Answers:}}`

`\textsf{Hence, on a clear, calm day, the relative humidity is closest to the \boxed{\sf dewpoint}}`

`\textsf{near sunrise, the coldest time of the day.}`

`\textsf{Hence, on a clear, calm day, the relative humidity is \boxed{\sf highest}} \ \textsf{near sunrise, the}`

`\textsf{coldest time of the day.}`