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converts to absolut Humidity

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Jan 2024-10-26 16:31:51 +02:00
parent d28b11acaa
commit 434b9860c3
4 changed files with 107 additions and 0 deletions
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3
go.mod Normal file
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module github.com/LeRoid-hub/humiditycalc
go 1.22.2

26
internal/calc.go Normal file
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package internal
import (
"math"
)
// AbsoluteHumidity calculates absolute humidity in g/m³ given temperature in Celsius and relative humidity percentage.
func AbsoluteHumidity(tempCelsius, relativeHumidity float64) float64 {
// Constants
const Mw = 18.016 // Molar mass of water vapor in g/mol
const R = 8.314 // Universal gas constant in J/(mol·K)
const A = 6.112 // Constant for saturation vapor pressure in hPa
const B = 17.67 // Constant for saturation vapor pressure
const C = 243.5 // Constant for saturation vapor pressure in Celsius
// Convert temperature from Celsius to Kelvin
tempKelvin := tempCelsius + 273.15
// Calculate saturation vapor pressure (in hPa) using temperature in Celsius
saturationVaporPressure := A * math.Exp(B*tempCelsius/(tempCelsius+C))
// Calculate absolute humidity
absoluteHumidity := (relativeHumidity / 100) * saturationVaporPressure * Mw / (R * tempKelvin)
return absoluteHumidity
}

9
main.go Normal file
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package main
import (
"github.com/LeRoid-hub/humiditycalc/server"
)
func main() {
server.Run()
}

69
server/server.go Normal file
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package server
import (
"fmt"
"net/http"
"strconv"
"github.com/LeRoid-hub/humiditycalc/internal"
)
// StartServer starts the HTTP server.
func Run() {
http.HandleFunc("/", HandleIndex)
http.HandleFunc("/absolute-humidity", HandleAbsoluteHumidity)
http.ListenAndServe(":8080", nil)
}
func HandleIndex(w http.ResponseWriter, r *http.Request) {
html := `<html>
<head>
<title>Humidity Calculator</title>
</head>
<body>
<h1>Humidity Calculator</h1>
<p>Calculate absolute humidity in g/m³ given temperature in Celsius and relative humidity percentage.</p>
<form action="/absolute-humidity">
<label for="temp">Temperature (°C):</label>
<input type="text" id="temp" name="temp" required>
<br>
<label for="rh">Relative Humidity (%):</label>
<input type="text" id="rh" name="rh" required>
<br>
<button type="submit">Calculate</button>
</form>
</body>
</html>`
w.Write([]byte(html))
}
func HandleAbsoluteHumidity(w http.ResponseWriter, r *http.Request) {
// Parse query parameters
tempCelsius, relativeHumidity := r.URL.Query().Get("temp"), r.URL.Query().Get("rh")
if tempCelsius == "" || relativeHumidity == "" {
http.Error(w, "missing query parameters", http.StatusBadRequest)
return
}
// Convert query parameters to float64
temp, err := strconv.ParseFloat(tempCelsius, 32)
if err != nil {
http.Error(w, "invalid temperature value", http.StatusBadRequest)
return
}
rh, err := strconv.ParseFloat(relativeHumidity, 32)
if err != nil {
http.Error(w, "invalid relative humidity value", http.StatusBadRequest)
return
}
// Calculate absolute humidity
absoluteHumidity := internal.AbsoluteHumidity(temp, rh)
// Write response
w.Write([]byte(fmt.Sprintf("Absolute humidity: %.2f g/m³\n", absoluteHumidity)))
}