The dew point is the temperature at which air is saturated with water vapor, at which water droplets start to condense and form dew on surfaces.

It also may defines -

The dew point or dew point temperature of a gas is the temperature at which the water vapor or low-boiling hydrocarbon derivatives contained in the gas is transformed into the liquid state.

When air has reached the dew-point temperature at a particular pressure, the water vapor in the air is in equilibrium with liquid water. A higher dew point temperature means that the air is more humid, while lower dew point temperature indicates that the air is drier.

#### Dew Point Calculation Formula

If you know the observed temperature and relative humidity the following formula can apply for a simpler calculation that gives an approximation of dew point temperature:

Td = T - ((100 - RH)/5)

Where,

- Td = dew point temperature (in degrees Celsius),
- T = observed temperature (in degrees Celsius), and
- RH = relative humidity (in percent). Apparently this relationship is fairly accurate for relative humidity values above 50%.

The dew point temperature can also be calculated using the following formula:

Td = 243.04 * (ln(RH/100) + ((17.625 * T) / (243.04 + T))) / (17.625 - ln(RH/100) - ((17.625 * T) / (243.04 + T)))

Where,

- Td = dew point temperature (°C)
- RH = relative humidity (%)
- T = air temperature (°C)

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