air:
  Density: 1.1885  # 20°C
  Electric Conductivity: 0.0 
  Heat Capacity: 1006.4  # 20°C
  Heat Conductivity: 0.025873  # 20°C
  Relative Permeability: 1
  Relative Permittivity: 1
ro4003c:
  Density: 1790  # 23°C
  Relative Permeability: 1
  Relative Permittivity: 3.55  
fr4:
  Density: 1850  # 23°C
  Relative Permeability: 1
  Relative Permittivity: 4.4
  Heat Conductivity: 0.81  # in-plane
ideal:
  Relative Permittivity: 1 
copper:
  Density: 8960.0  # 0°C
  Electric Conductivity: 59600000  # 20°C
  Emissivity: 0.012  # 327°C
  Heat Capacity: 415.0  # 200°C
  Heat Conductivity: 401.0  # 0°C
  Relative Permeability: 1
  Relative Permittivity: 1
steel_1.4541:
  Density: 7900.0  # 20°C
  Electric Conductivity: 1370
  Emissivity: 0.111  # 200°C
  Heat Capacity:  470.0 # 20°C
  Heat Conductivity: 15.0 # 20°C
  Relative Permeability: 1
  Relative Permittivity: 1
water:
  Density: 1000.0
  Heat Capacity: 4182.0
  Heat Conductivity: 0.6