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chemical notation

n.
1.a notation used by chemists to express technical facts in chemistry

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    Idiom of the Day

    out of practice
    performing poorly due to a lack of practice
    I am out of practice and I cannot play the trumpet very well now.



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    Invention
    Invention : electrocardiogram (ecg, ekg)
    Year : 1903
    Inventor : willem einthoven
    Country : the netherlands.      .. More >>
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