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photometer

n.
1.measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source
2.photographic equipment that measures the intensity of light

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    Idiom of the Day

    for once
    only one time
    For once, my friend listened to what I was saying. Usually he ignores me.



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    Invention
    Invention : vending machine
    Year : c. 100-200 bc
    Inventor : -
    Country : egypt.      .. More >>
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