1625 in science
# 1625 in science

The year 1625 in science and technology involved some significant events.

## Chemistry

* First description of hydrogen by Johann Baptista van Helmont. First to use the word "gas".
* Johann Rudolf Glauber discovers sodium sulfate (sal mirabilis or "Glauber's salt", used as a laxative) in Austrian spring water.

## Births

* June 8 – Giovanni Cassini, Italian astronomer (died 1712)
* March 25 – John Collins, English mathematician (died 1683)
* August 13 – Rasmus Bartholin, Danish scientist (died 1698)
* December 16 – Erhard Weigel, German mathematician and scientific populariser (died 1699)
* December 20 – David Gregory, Scottish physician and inventor (died 1720)
* Samuel Morland, English inventor (died 1695)

## Deaths

* March 7 – Johann Bayer, German uranographer (born 1572)
* April 7 – Adriaan van den Spiegel, Flemish-born anatomist and botanist (born 1578)
* May 6 – George Bruce of Carnock, Scottish coal mining engineer (born c.1550)
* Ferrante Imperato, Neapolitan natural historian (born 1550)
* Willem Schouten, Dutch navigator, died at sea (born c. 1567)
