## Mass and Weight

`GSL_CONST_MKS_POUND_MASS`
  The mass of 1 pound.
`GSL_CONST_MKS_OUNCE_MASS`
  The mass of 1 ounce.
`GSL_CONST_MKS_TON`
  The mass of 1 ton.
`GSL_CONST_MKS_METRIC_TON`
  The mass of 1 metric ton (1000 kg).
`GSL_CONST_MKS_UK_TON`
  The mass of 1 UK ton.
`GSL_CONST_MKS_TROY_OUNCE`
  The mass of 1 troy ounce.
`GSL_CONST_MKS_CARAT`
  The mass of 1 carat.
`GSL_CONST_MKS_GRAM_FORCE`
  The force of 1 gram weight.
`GSL_CONST_MKS_POUND_FORCE`
  The force of 1 pound weight.
`GSL_CONST_MKS_KILOPOUND_FORCE`
  The force of 1 kilopound weight.
`GSL_CONST_MKS_POUNDAL`
  The force of 1 poundal.