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Raoul Pictet
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<p>Raoul-Pierre Pictet (4 April 1846 – 27 July 1929) was a <a href="/facts/Swiss_people/3ecWX2K6">Swiss</a> <a href="/facts/Physicist/cQcgvSIm">physicist</a>. Pictet is co-credited with French scientist <a href="/facts/Louis-Paul_Cailletet/ub5JrFYM">Louis-Paul Cailletet</a> as the first to produce liquid <a href="/facts/Oxygen/acyn6o8r">oxygen</a> in 1877. </p>