Dew Point Approx Calculator
Explicit liquid-water Magnusapproximation17.62/243.12°Cmatched airtemperature−40to60°C,0<RH≤1. Not petroleum dewpointpressure, ice-branch dewpoint or exact humidity thermodynamics.
Description
Dew point is the temperature at which air reaches saturation for its water-vapor content.
Dew point is the temperature at which air reaches saturation for its water-vapor content.1
This approximation uses a liquid-water Magnus relation and relative humidity expressed as a fraction. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Dew Point Approx Calculator
Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the independently reviewed engineering model, geometry, material properties, units and governing reference edition.
How to use Dew Point Approx Calculator and understand its results
- Establish the independently reviewed engineering model, geometry, material properties, units and governing reference edition.
- Enter actualAirTemperatureCelsius, actualRelativeHumidityFraction, using the field meanings and rules below, then run the tool.
- Read result.conditionalMagnusDewPointCelsius. Interpret each field using the units, signs and evidence rules below.
- If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualAirTemperatureCelsius | Actual air temperature celsius | number | Required |
| actualRelativeHumidityFraction | Actual relative humidity fraction | number | Required |
Require finite air temperature in inclusive −40…60°C and humidity fraction in (0,1]. Calculate gamma=ln(RH)+17.62T/(243.12+T), then 243.12gamma/(17.62−gamma). Saturation returns the supplied air temperature up to floating-point precision. Percent humidity must be converted to a fraction before entry. No ice-saturation branch is selected.
gamma=ln(relativeHumidityFraction)+17.62×temperatureC/(243.12+temperatureC); dewPointC=243.12×gamma/(17.62−gamma) Apply the field units and exact ordering, boundary and evidence rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result containing the calculation or selected reference fields below | object |
| result.conditionalMagnusDewPointCelsius | Conditional Magnus Dew Point Celsius; use the units, sign convention and calculation stated above | number |
{
"input": {
"actualAirTemperatureCelsius": 20,
"actualRelativeHumidityFraction": 0.5
},
"output": {
"result": {
"conditionalMagnusDewPointCelsius": 9.255174598981256
}
}
}Limitations and assumptions
This approximation uses a liquid-water Magnus relation and relative humidity expressed as a fraction. Results depend on the independently established measurement basis and the exact model assumptions above.
Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.
Alternative or Complementary methods
Use Single-Rod Earthing Resistance Calculator to examine a related aspect: Single-rod earthing models relate soil resistivity to embedded rod geometry.
Use Pump Specific Speed Calculator where its separate inputs and scope apply: Pump specific speed compares angular speed, discharge and head.
References
-
Dew Point Approx Calculator — tool.io
Similar or alternative tools
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