1648 in science

The year 1648 in science and technology involved some significant events.

Astronomy

Johannes Hevelius discovers the longitudinal libration of the Moon.{{cite book | editor=Jacqueline Bergeron| title =Highlights of Astronomy: As Presented at the XXIst General Assembly of the IAU, 1991| publisher =Springer Science & Business Media| year =2013| page =521| isbn =9401128286}}

June–September – Semyon Dezhnyov makes the first recorded voyage through the Bering Strait.{{cite book|editor=Fisher, Raymond H.|title=The Voyage of Semen Dezhnev in 1648|location=London|publisher=Hakluyt Society|year=1981|isbn=0-904180-07-7}}

Willem Piso and Georg Marcgrave's Historia Naturalis Brasiliae is published in the Netherlands.{{cite web|title=Willem Piso|url=http://www.illustratedgarden.org/mobot/rarebooks/author.asp?creator=Piso,%20Willem&creatorID=111|first=Robert F|last=Erickson|work=Rare Books from the MBG Library|publisher=Missouri Botanical Garden|accessdate=2011-04-02}}

September 19 – Blaise Pascal's brother-in-law, Florin Périer, demonstrates in an ascent of the Puy-de-Dôme that atmospheric pressure varies with height.{{citation needed|date=April 2018}}

Clear script, used by the Torgut Mongols of Sinkiang, is developed by Zaya Pandita.

Jan Baptist van Helmont's collected works, Ortus medicinae, vel opera et opuscula omnia, are published posthumously by Lodewijk Elzevir in Amsterdam, edited and Latinized by his son Franciscus Mercurius van Helmont. Transitional between alchemy and chemistry, they contain the results of numerous experiments and establish an early version of the law of conservation of mass.{{cite web|title=Johann Baptista van Helmont|work=History of Gas Chemistry|publisher=Center for Microscale Gas Chemistry, Creighton University|date=2005-09-25|url=http://mattson.creighton.edu/History_Gas_Chemistry/vanHelmont.html|accessdate=2007-02-23}}