# Relative Humidity

Not Reviewed
rh =
Tags:
Rating
ID
Anastase.Relative Humidity
UUID
0deac1de-f2eb-11e3-b7aa-bc764e2038f2

The Relative Humidity calculator computes the relative humidity based on the actual density of vapor and the saturated density.

INSTRUCTIONS: Choose units and enter the following:

• (W) This is the actual density of vapor
• (Ws)  This is the saturation density.

Relative Humidity(rh): The calculator returns the relative humidity as a percentage.

#### The Math / Science

Relative humidity is the amount of moisture in the air compared to what the air can "hold" at that temperature.  Relative Humidity is also a common index regarding human comfort maintaining a normal temperature.  Human comfort is ideally near 50% RH, while RD less than 30% is dry air and RD greater than 70% is considered humid.

When the air can't "hold" all the moisture,then it condenses as dew.

rh = W/Ws

where:

• rh is the relative humidity converted to a percentage
• W is the actual density of the vapor
• Ws is the saturation density of the air.