Are weapons made in metric or standard system?

In article >,
Jeff Strickland > wrote:
>
>"Matthew Russotto" > wrote in message
...
>> In article >,
>> Jeff Strickland > wrote:
>>>
>>>I don't know that it was a Democrat or not, but a kiloton is a
>>>thousand-ton,
>>>so 18 kilotons is 18 thousand tons. I'm not sure this is a metric
>>>measurement...
>>
>> Nowadays the kiloton is defined such that a gram of TNT is one
>> kilocalorie. I suspect that back in 1945 it was more likely to have
>> been related to an American short ton rather than a metric ton,
>> though.
>>
>
>
>Kilo is the number of the measurment units, it means one thousand. Ton is
>the measurement unit, and is a non-metric measurment unit. A kiloton is
>nothing more than one thousand tons. One thousand non-metric units of
>measure.

Different kiloton, though they are related. This is a kiloton of TNT
equivalent explosive yield, not a kiloton of weight. A kiloton TNT is
1000 tons TNT, a ton TNT is 1000 kg TNT (this is the part I suspect was
different in 1945; I suspect a ton TNT back then was 2000 pounds TNT),
and a kg TNT is of course 1000 grams TNT. A gram of TNT-equivalent
explosive yield is defined as 1 kilocalorie (actual TNT varies), and a
kilocalorie is 4184 joules -- this last is a perfectly good SI unit,
so you can unwind and find out that 1 kiloton of TNT equivalent is
4184 terajoules in the metric system.
--
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