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How To Calculate Dew Point Temperature

Dew Point Formula:

\[ T_d = T - \left(\frac{100 - RH}{5}\right) \]

°C
%

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1. What is Dew Point Temperature?

The dew point temperature is the temperature at which air becomes saturated with water vapor and dew begins to form. It's a measure of atmospheric moisture and indicates how much the air must cool to reach saturation.

2. How Does the Calculator Work?

The calculator uses the simple dew point formula:

\[ T_d = T - \left(\frac{100 - RH}{5}\right) \]

Where:

Explanation: This simplified formula provides a quick estimate of dew point when more precise methods aren't available. The formula shows that dew point increases with both temperature and relative humidity.

3. Importance of Dew Point Calculation

Details: Dew point is crucial for understanding comfort levels, predicting fog formation, assessing drying conditions, and preventing condensation in buildings and industrial processes.

4. Using the Calculator

Tips: Enter temperature in Celsius and relative humidity as a percentage (0-100%). The calculator will estimate the dew point temperature in Celsius.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between dew point and humidity?
A: Relative humidity measures current moisture relative to maximum possible at that temperature, while dew point measures absolute moisture content in the air.

Q2: What does a high dew point indicate?
A: High dew points (>15°C) indicate muggy conditions, while very high dew points (>21°C) feel oppressive and tropical.

Q3: Can dew point be higher than temperature?
A: No, by definition dew point cannot exceed the current air temperature (100% relative humidity).

Q4: How accurate is this simplified formula?
A: It provides a reasonable estimate but may differ from more precise calculations by 1-2°C in some conditions.

Q5: What's the comfort range for dew point?
A: Most people find dew points below 16°C comfortable, while above 18°C starts to feel humid, and above 21°C feels uncomfortable.

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