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Derek Broughton wrote on Jan 17:
John Bachman wrote on Jan 16: wrote on Jan 16: wouldn't it be simpler, 1000g = 1kg = 1l? You have confused the measurements of volume and weight. 1000 milli-liters = 1 liter. 1000 grams = 1 kilogram. Not really. For water, the figures are the same. 1kg = 1l ONLY at the tripple point of water which is 3.98C. At room temperature there is a .2% discrepancy. At the boiling point there is a 4.4% discrepancy since the water expands and liters don't. So one could say that 1kg of water is approximately 1 liter in volume. As John pointed out you can never say 1kg = 1l. It is like saying that 1 apple = 1 pear. -- Pardon my spam deterrent; send email to 18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6 Cheers, Steve Henning in Reading, PA USA |
#47
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John Bachman wrote:
On Tue, 18 Jan 2005 17:12:24 -0500, Stephen Henning wrote: Derek Broughton wrote on Jan 17: John Bachman wrote on Jan 16: wrote on Jan 16: wouldn't it be simpler, 1000g = 1kg = 1l? You have confused the measurements of volume and weight. 1000 milli-liters = 1 liter. 1000 grams = 1 kilogram. Not really. For water, the figures are the same. 1kg = 1l ONLY at the tripple point of water which is 3.98C. At room temperature there is a .2% discrepancy. At the boiling point there is a 4.4% discrepancy since the water expands and liters don't. So one could say that 1kg of water is approximately 1 liter in volume. As John pointed out you can never say 1kg = 1l. It is like saying that 1 apple = 1 pear. See what happens when you ask for engineers? You get buggered on the details. While in the first approximation 1 liter of water has a mass of 1 Kilogram it is not correct to say that 1 l = 1Kg. Sorry that you asked? Hey, don't put that on me!! In the first place, I didn't ask. I only complained at you guys being so picky (and Keith for reviving a thread that had been dead for two months). In the second, you have both snipped a vital part of the context. I said "the figures are the same (within tolerances)." I stand by that. Only a completely anal-retentive engineer would feel otherwise when we're talking about a hobby pond (I do AR pretty well, but I'm reasonably certain that _none_ of us have ever had a pond come even close to the boiling point - even the guys who have ponds in Colorado). I consider it a deliberate fraud that Stephen removed the parenthetical expression AND put a period in. And no, it isn't even close to saying that one apple = one pear. -- derek |
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