One liter of water has a mass of almost exactly one kilogram when measured
at its maximal density, which occurs at about 4 °C. Similarly: 1
milliliter of water has a mass of about 1 g; 1,000 liters of water has a
mass of about 1,000 kg (1 ton). This relationship holds because the gram
was originally defined as the mass of 1 mL of water.
----- Message from cont...@metricpioneer.com ---------
Date: Fri, 28 Mar 2014 15:06:51 +0000
From: cont...@metricpioneer.com
Reply-To: cont...@metricpioneer.com
Subject: [USMA:53657] RE: SI Trivia Survey B
To: "U.S. Metric Association" <usma@colostate.edu>
The question is intended to familiarize Americans with the basics. In
normal, daily routine, like cooking, shopping, et cetera, Americans need
to know the basics, not rocket science.
----- Message from Martin Vlietstra <vliets...@btinternet.com> ---------
Date: Fri, 28 Mar 2014 05:41:08 -0000
From: Martin Vlietstra <vliets...@btinternet.com>
Reply-To: vliets...@btinternet.com
Subject: [USMA:53656] RE: SI Trivia Survey B
To: "U.S. Metric Association" <usma@colostate.edu>
I think that David was trying to create a variation of the question -
"Which is heavier, a pound of feathers or a pound of gold" - the answer
is "a pound of feathers" because gold uses troy weight and there are 12
troy ounces in a troy pound.
I was drawing on my experience as a computer programmer where it was
drummed into me - NEVER test two real numbers for equality only unless
you really mean "exactly equal". As one wag put it - "0.1 x 10.0 gives
a number which is approximately 1".
-----Original Message-----
From: owner-u...@colostate.edu [mailto:owner-u...@colostate.edu] On
Behalf Of John Altounji
Sent: 27 March 2014 22:26
To: U.S. Metric Association
Subject: [USMA:53655] RE: SI Trivia Survey B
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[1] 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
----- End message from Martin Vlietstra <vliets...@btinternet.com> -----
David Pearl www.MetricPioneer.com[1] 503-428-4917
----- End message from cont...@metricpioneer.com -----
Links:
------
[1] http://www.MetricPioneer.com
David Pearl www.MetricPioneer.com 503-428-4917
