Question

question 3

tempeature	dew point	relative humidity	heat index
tempeature	dew point	relative humidity	heat index
$90^circ$	$70^circ$	$52\\%$	$96^circ$

what does a relative humidity of 100% mean?

• the air pressure is at its highest
• the air temperature is at its maximum
• the air is saturated with water vapor and can hold no more
• it will definitely rain

Explanation:

To determine the meaning of 100% relative humidity, we analyze each option:

• "The air pressure is at its highest": Relative humidity relates to water vapor, not air pressure. Eliminate this.
• "The air temperature is at its maximum": Relative humidity and air temperature are related but 100% RH doesn't mean max temp. Eliminate.
• "The air is saturated with water vapor and can hold no more": By definition, relative humidity (RH) is the ratio of actual water vapor to the maximum water vapor air can hold at a given temp. 100% RH means the air has the maximum amount of water vapor it can hold (saturated). This matches the definition.
• "It will definitely rain": 100% RH is a condition for possible precipitation, but it doesn't guarantee rain. Eliminate.

Answer:

C. The air is saturated with water vapor and can hold no more