Braingle: '1=1=?' Brain Teaser

1=1=?

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

Puzzle ID:	#39051
Fun:	(2.41)
Difficulty:	(2.11)
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?

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Comments

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.