Pressure and Boiling.yml

type: custom:plotly-graph
title: Pressure and Boiling Point
entities:
  - entity: sensor.gw1100c_relative_pressure
    type: line
    name: |
      $ex {
        const raw_pressure_hPa = parseFloat(ys.at(-1));
        const corrected_pressure_hPa = raw_pressure_hPa - 80.7; // 80.7 is because this is at 722m above MSL
        const P1 = 1013.25; // Standard atmospheric pressure in hPa
        const T1 = 373.15; // Boiling point of water at standard pressure in Kelvin
        const delta_H_vap = 40790; // Enthalpy of vaporization in J/mol
        const R_gas = 8.314; // Universal gas constant in J/(mol·K)

        const P2 = corrected_pressure_hPa;
        const T2 = 1 / ((1 / T1) - (R_gas * Math.log(P2 / P1) / delta_H_vap));
        const boiling_point_C = T2 - 273.15; // Convert from Kelvin to Celsius

        return "Raw Pressure " + raw_pressure_hPa.toFixed(2) + " hPa, Boiling Point " + boiling_point_C.toFixed(2) + " °C";
      }
    line:
      width: 1
      shape: spline
      color: yellow
    statistic: mean
    period: 5minute
layout:
  yaxis:
    title: Pressure
    side: left
  xaxis:
    title: Time
  showlegend: true
hours_to_show: 48
refresh_interval: 10