Coisas Vale

Coisas Vale brings a working statistical-mechanics laboratory to your pocket. Powered by a real Metropolis Monte Carlo engine, it simulates a 2D Ising lattice of magnetic spins entirely on-device — no cloud, no account, just pure physics at your fingertips. Watch magnetic domains form and dissolve as you drag the temperature slider from deep order to thermal chaos. Cross the Curie point and see the lattice shatter into disordered noise; cool it back down and watch coherent domains crystallise in real time. Capture any configuration as a named snapshot and revisit it later in the Domain Gallery. Explore two classic experiments without a university lab. The Phase Explorer plots the magnetisation-versus-temperature curve and its susceptibility peak as the system sweeps through the critical point. The Hysteresis Loop traces the full M-vs-h cycle and lets you scrub through it to measure coercivity and remanence. Every chart is driven by real simulation data — nothing is pre-computed or approximated. The Guide screen makes the Metropolis acceptance rule hands-on: adjust temperature and energy difference live and watch the probability formula respond. Lattice size, boundary conditions, coupling strength, external field, and random seed are fully configurable. All settings and snapshots persist across sessions so your experiments carry forward exactly where you left off.