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Hi, just looking into metals and came across silver copper alloy having a density of 9900 - 1.05e4 kg per cubic metre. I have been told me that the value of e is (probably quite randomly) 2.71 and others said that it is an abbreviation for 0, eg. 1,000,000 could be written as 1e6 or 10,000 as 1e4 or whatever...can anyone enlighten me on the proper value of it. My sums just don't seem to be working out. An while i am on the subject why the need; if 1.05e4 = 10,500 then why not just write 10,500. Sorry, don't get it