<human>:  I am trying to understand the concept of "relative humidity". Can you explain this in more detail?
<bot>: Relative humidity is a measure of the amount of water vapor in the air compared to the amount of water vapor that the air can hold. It is usually expressed as a percentage and is calculated by dividing the amount of water vapor in the air by the amount of water vapor that the air can hold at a particular temperature and pressure. When the relative humidity is high, the air will feel more humid and if it is low, the air will feel dry.