I don't understand all this discussion. The same is fine if you go 3 significant digits. Density of liquid water
Temp (°C) Density (kg/m3)[20][21] +100 958.4 +80 971.8 +60 983.2 +40 992.2 +30 995.6502 +25 997.0479 +22 997.7735 +20 998.2071 +15 999.1026 +10 999.7026 +4 999.9720 0 999.8395 −10 998.117 −20 993.547 −30 983.854 The values below 0 °C refer to supercooled water. Source Wikipedia. I would say you may add room temperature, though not necessary. John Altounji One size does not fit all. Social promotion ruined Education. -----Original Message----- From: owner-u...@colostate.edu [mailto:owner-u...@colostate.edu] On Behalf Of Martin Vlietstra Sent: Thursday, March 27, 2014 3:10 PM To: U.S. Metric Association Subject: [USMA:53654] RE: SI Trivia Survey B Hi David, There are two options - one is not to have asked the question, the other is to have used the word ("about the same (dependant on temperature)" rather than "the same" ). Regards Martin -----Original Message----- From: cont...@metricpioneer.com [mailto:cont...@metricpioneer.com] Sent: 27 March 2014 21:07 To: Martin Vlietstra; U.S. Metric Association Subject: Re: [USMA:53650] RE: SI Trivia Survey B Martin. I am trying to educate Americans, not split hairs. Would it be better to rephrase the question with all that hair-splitting detail? Surely they would fall asleep! How would you more accurately ask the question? ----- Message from Martin Vlietstra <vliets...@btinternet.com> --------- Date: Thu, 27 Mar 2014 20:46:54 -0000 From: Martin Vlietstra <vliets...@btinternet.com> Reply-To: vliets...@btinternet.com Subject: [USMA:53650] RE: SI Trivia Survey B To: "U.S. Metric Association" <usma@colostate.edu> > Hi David, > > I wish to dispute the answer to the first question. According to > Wikipedia > (https://en.wikipedia.org/wiki/Density_of_water#Density_of_water_and_i > ce), water at 4 °C has a mass of 0.99970 kg. As it either gets hotter > or > colder, it expands, making a litre of water less than 0.99970 kg. > Moreover, if the weighing is done in air, then then the gold displaces > less air than water (it is more dense), so, by Archimedes principle, > the water receives a greater upthrust due to buoyancy in air than does > the gold. > > Therefore, a kilogram of gold weighs [very slightly] more than a litre > of water. > > Regards > > Martin > > -----Original Message----- > From: owner-u...@colostate.edu [mailto:owner-u...@colostate.edu] On > Behalf Of cont...@metricpioneer.com > Sent: 27 March 2014 17:22 > To: U.S. Metric Association > Subject: [USMA:53649] SI Trivia Survey B > > Second one in a series: SI Trivia Survey B: https://t.co/Vvex57DK6L > > David Pearl www.MetricPioneer.com 503-428-4917 David Pearl > MetricPioneer.com 503-428-4917 ----- End message from Martin Vlietstra <vliets...@btinternet.com> ----- David Pearl MetricPioneer.com 503-428-4917
