Mollier h–x Diagram Web App

A browser-based, pressure-aware psychrometric calculator with live charting.

✨ Features

• Bidirectional solver – Enter any two of T (°C), RH (%), and x (g/kg dry air). The app computes the full state: dew-point (T_{dp}), enthalpy (h), saturation (p_{ws}), partial vapour pressure (p_w), etc.
• Altitude-aware – Barometric pressure (p) is derived from Altitude (m ASL) via the standard-atmosphere model (no fixed sea-level assumption).
• Live h–x chart – Plots the current state, saturation curve, and example RH isopleths (40 % & 60 %) with dew-point and enthalpy annotations.
• Offline – 100 % client-side; works after first load.
• Zero install – Vanilla HTML/JS + Plotly.

🚀 Quick start

1. Clone or download this repository.
2. Open h-x_diagram.html in any modern browser (Chromium ≥102, Firefox ≥100, Safari ≥15).