On Fri, Feb 28, 2014 at 12:47:05PM +1300, LizR wrote: > On 28 February 2014 07:47, John Clark <johnkcl...@gmail.com> wrote: > > > > > Food energy is not all that dilute, a 1000 calorie jelly doughnut has > > about as much chemical energy as a hand grenade. > > > > You have 1000 calorie jelly doughnuts??? (What's that in metric units?) >
Actually, a calorie _is_ a metric unit (it is defined as the amount of heat needed to raise 1 gramme of water by 1 degree Celsius (or Kelvin)), but it is not an SI unit. Actually, there are two different definitions of "calorie", a small calorie (as defined above) and a large calorie (equivalent to 1000 small calories) which is commonly used in dieter's books. To convert from calorie to SI units, you need to use the specific heat of water, which is about 4200 J/kg, meaning that 1 cal is about 4.2 Joules, or 1 Cal is about 4.2 kJ. What do they teach in schools these days? Cheers -- ---------------------------------------------------------------------------- Prof Russell Standish Phone 0425 253119 (mobile) Principal, High Performance Coders Visiting Professor of Mathematics hpco...@hpcoders.com.au University of New South Wales http://www.hpcoders.com.au ---------------------------------------------------------------------------- -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
