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_ice), 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: [email protected] [mailto:[email protected]] On Behalf Of [email protected] 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
