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## 1=1=?

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 Puzzle ID: #39051 Fun: (2.42) Difficulty: (2.12) Category: Science Submitted By: AndrewWalker Corrected By: calmsavior

One ml of pure water is equal to one cubic cm and is one gram. But Jonie had a sample of one ml of pure water but its mass was slightly more than a gram. How can this be?

### Hint

The scale she used was accurate and she found the exact mass of the beaker then subtracted it from the total.
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 tpg76 Nov 03, 2007 Good answer, but a more common explanation would simply to have water that is cooled a little. Your density statement is only precisely true at 25 C (and 1 atm). Water that is cooled to, say, 20 C will weigh more - per cc. (Be careful, though - as water expands again, upon cooling, as it approaches the freezing point. But not around 20 C. See? No nuclear chemistry needed for a plausible answer/explanation. AndrewWalker Nov 03, 2007 Thanks for the tip. I know that at 4 deegrees celsius is when water begins to expand. AndrewWalker Nov 03, 2007 This is also my first teaser. jasmin215 Nov 03, 2007 very cute, never heard of heavy water, i hear of hard water but never measured it nice job for your first one ElectronJohn Nov 28, 2007 Nice teaser. I knew about heavy water and figured that was what you were talking about even though you did not stipulate STP (Standard Temperature and Pressure). fizzmaister Mar 10, 2008 @electron. At STP it would be ice. stephiesd Mar 26, 2008 Hahaha! Yes! I just learned about heavy water last Wednesday in Chemistry class. Well, I still got it wrong, but still. Wa11E Sep 20, 2008 Thanks for the tip. I know that at 4 deegrees celsius is when water begins to expand Yes - which water... pure, impure, heavy? princess2007 Mar 09, 2011 I actually guessed both the heavy water and temperature difference options! I think they're both valid answers. For a first teaser, this is realllly good! Candi7 Jun 12, 2012 Heavy Water? Never heard of it. Or if I did, I forget it. I immediately thought that the water was cooled.