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


Puzzle ID:#39051
Fun:*** (2.43)
Difficulty:** (2.09)
Submitted By:AndrewWalkerAfi*****!
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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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.
Nov 03, 2007

Thanks for the tip. I know that at 4 deegrees celsius is when water begins to expand.
Nov 03, 2007

This is also my first teaser.
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
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).
Mar 10, 2008

@electron. At STP it would be ice.
Mar 26, 2008

Hahaha! Yes! I just learned about heavy water last Wednesday in Chemistry class.

Well, I still got it wrong, but still.
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?
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!
Jun 12, 2012

Heavy Water? Never heard of it. Or if I did, I forget it. I immediately thought that the water was cooled.

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