Units of measurement - Weight
    
    This game uses SI units for measuring mass (and hence weight under a
      normal gravitational field). 
    
    The SI units for mass are: 
    
      - Tonne (tn), equal to 1,000 kilograms, equivalent to approximately an
        imperial ton; 
- Kilogram (kg), equivalent to approximately 2.2 pounds (lbs); 
- Gram (g), equal to 1/1,000 kilogram, equivalent to approximately 1/30
        of an ounce (oz).