Dear All, John's microwave oven is starting to look like another case of 'hidden metric'.
That is his oven was designed to be 25�litres, it was built to be 25�litres, it was tested at 25�litres � and then dumbed down to some odd number of decimal cub ft for sales purposes. John should simply assume that it is a 25 litre oven and get on with the rest of his life. There is absolutely no future in doing conversions backwards and forwards. By the way, some years ago, I read the Australian Standard for evaluating the power of a microwave oven. From memory, it involved placing a beaker with 200�millilitres of water in the oven and then observing the temperature of the water after one (or was it two?) minutes. Then, assuming a litre of water has a mass of a kilogram, calculating the power rating of the oven (in watts) was quite straight forward. (You also need to know that the specific heat of water is 4187�J/kgK) I found it interesting that this standard method was based on the actual heating of the contents of the oven rather than a calculation of the power based on the amount of electrical energy supplied. Cheers, Pat Naughtin Geelong, Australia 61 3 5241 2008 [EMAIL PROTECTED] http://www.metricationmatters.com on 2004-12-27 09.12, Bill Potts at [EMAIL PROTECTED] wrote: > David King wrote: "The 0.09 cubic feet figure you quoted is slightly more > than 25 litres, so I wonder if that was a rough conversion or the figure for > the external volume?" > > Looks like a bad case of big foot. 0.09 cu. ft. is just over 2.5 L. > > In fact, John had his decimal point in the wrong place and should have said > 0.9 cubic feet, which is about 25.5 L. > > Bill Potts, CMS > Roseville, CA > http://metric1.org [SI Navigator] >
