g/ml:
  g/ml: 1
  kg/m3: 1000
  lb/ft3: 62.42197
  lb/in3: 0.036127
kg/m3:
  g/ml: 0.001
  kg/m3: 1
  lb/ft3: 0.062422
  lb/in3: 0.000036
lb/ft3:
  g/ml: 0.01602
  kg/m3: 16.02
  lb/ft3: 1
  lb/in3: 0.000579
lb/in3:
  g/ml: 27.68
  kg/m3: 27680
  lb/ft3: 1727.84
  lb/in3: 1