{
  "basis": "Independent teaching assumptions; no manufacturer measurements or experimental calibration",
  "geometry_mm": {"width":36.0,"height":78.0,"thickness":4.45},
  "density_kg_m3":2400.0,
  "specific_heat_J_kgK":1000.0,
  "effective_surface_loss_W_m2K":8.0,
  "ambient_temperature_C":25.0,
  "initial_temperature_C":25.0,
  "heating_duration_s":600.0,
  "total_duration_s":1800.0,
  "baseline_heat_W":1.0,
  "comparison_heat_W":2.0,
  "spatial_extension":{
    "method":"Conservative 2D cell-centered finite volume, uniform temperature through thickness",
    "kx_W_mK":20.0,"ky_W_mK":20.0,
    "nx":24,"ny":52,"dt_s":0.5,
    "viewer_interval_s":10.0,"vtk_interval_s":60.0,
    "localized_fraction":0.8,
    "patch_local_mm":{"x_min":21.0,"x_max":33.0,"y_min":57.0,"y_max":75.0},
    "source_interpretation":"80 percent of 2 W inside the specified patch, 20 percent spread over the full cell volume; 2 W total, not an extra 2 W",
    "boundary_interpretation":"Same effective coefficient on both broad faces and four edges. Edge face loss includes half-cell conduction resistance. No enclosure or inter-component heat transfer.",
    "conductivity_basis":"New illustrative in-plane conductivities used only for the spatial extension; not used or fitted in the 0D comparison"
  }
}