{% set T = states('sensor.agv_esp32_greenhouse_inside_temperature')|float(none) %}
          {% set RH = states('sensor.agv_esp32_greenhouse_inside_humidity')|float(none) %}
          {% if T is not none and RH is not none and RH > 0 %}
            {% set a = 17.62 %}
            {% set b = 243.12 %}
            {% set gamma = (a * T) / (b + T) + log(RH / 100) %}
            {{ ((b * gamma) / (a - gamma)) | round(2) }}
          {% else %}
            {{ none }}
          {% endif %}