Guinness World Records - Officially Amazing

Next RecordPrevious Record

For the record

  • Who:

  • What: Least dense solid

  • Where: United States

The world's least dense solid is an aerogel produced by Lawrence Livermore National Laboratory, Livermore, California, USA. With a density of just 1mg/cm3 (0.25 grains/in3), this aerogel is lighter than air itself (1.2 mg/cm3, 0.3 grains/inch3) and is virtually invisible to the untrained eye. Aerogel with this density was first created on 10 April 2003.

note, the '3' after 'cm' and 'in' should be superscript - as in cubed.


Records change on a daily basis and are not immediately published online. For the most up to date record information, we welcome your questions via Facebook or Twitter.

Comments below may relate to previous holders of this record.