Property of matter to resist changes of the state of motion and to attract other bodies

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From Monday 5 October, all bags will be searched before entry to help keep Wellcome Collection safe and secure. Please allow extra time on arrival. 

Due to essential system maintenance, the library's online requesting service will be unavailable from 2pm on Friday 2 October until 10am on Tuesday 6 October. You can still search the catalogue as usual. We apologise for any inconvenience.

We're running paid user research studies to improve Wellcome Collection online

Take part in research

Archive collection level pages, plus the archive collection treatment on the work page and in search results.

The catalogue API's shortDescription is shown on the archive collection hero and in search results.

Archive collection

The four thematic browsing category pages (subjects, places, people & organisations, types & techniques) become accessible.

Subject sub-category pages become accessible, and the subjects category page gains a sub-category menu.

Mass (Physics)