# Water to steam

by sparc
Tags: steam, water
 P: 2 Hi all, I am looking to find out how much water expands when it turns to steam at the same pressure. like if you have an open pot with water boiling on the stove. if you took one ounce of that water how much steam does it turn into? I have searched the internet and come up with various answers which are close but not the same. I've found reference to 1647 times, 1689, and over 1700. So which is right or none of them?
 Admin P: 21,866 At 212°F, 14.7 psia, liquid water has a specific volume of 0.016716 ft3/lbm and steam has a specfic volume of 26.80 3/lbm, which is a volume ratio of ~1603 : 1 of steam:water. Ref: http://www.eas.asu.edu/~holbert/eee463/SteamTable.pdf
 P: 2 Thank you for your assistance, that's what i was looking for, though the ratio is lower than i found elsewhere for 14.7 psia. any idea why there is such a wide range of 'correct' answers to this condition? It seems that it would be straight forward and the answer should be consistent for the same conditions.