I really don't know unless those values do not account for the thermal expansion of the liquid water.
For example, water at 80°F has a specific volume of 0.016073 ft3
/lbm so the liquid water at 212°F
with a specific volume of .016716 3
/lbm has volume of 1.04 times that of water at 80°F
, and the steam at 212°F
has then 1667 times the volume of liquid water at 80°F
The steam to water volume ratio depends on which reference temperature one selects for the water and the ambient pressure.