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* [http://www.ungeklimaforskere.dk/is/hvad-kan-is/76-massefylde-vand Massefylde – Vand]
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* {{en sprog}} [http://www.duffieldtimber.com/glossary.html Duffield Timber – wood importer and sawmiller]
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* {{en sprog}} [http://www.lenntech.com/Chem-physical-resistance-data-fibres.htm Chemical & Physical Resistance Data for Fibres]
* {{en sprog}} [http://hypertextbook.com/facts/ The Physics Factbook] f.eks.:
** [http://hypertextbook.com/facts/1999/KatrinaJones.shtml Density of Concrete]
** [http://hypertextbook.com/facts/2000/ShirleyLam.shtml Density of Wood]
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* {{en sprog}} [http://www.natural-stone.com/stonesearch.html natural-stone.com], [http://www.natural-stone.com/stonetips.htm Stonetips]
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* {{en sprog}} [http://www.geocentricity.com/geocentricity/nieto.html Rebuttal of North and Nieto. Martin Selbrede.] Hypotetisk [[maximon]]s middelmassefylde.
* {{en sprog}} [http://www.periodic-table.org.uk/element-radon.htm The Element Radon]
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* {{en sprog}} [http://www.alulight.com/english/products/sound.htm Sound Absorption. alulight international] Citat: "...is non inflammable and does not release toxic gases..."
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* {{en sprog}} [http://www.grow.arizona.edu/water/galileothermometer.shtml Flydende vands massefylde som funktion af temperaturen]
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* {{en sprog}} [http://www.grc.nasa.gov/WWW/K-12/airplane/fluden.html Gas density]
* {{en sprog}} [http://www.science.co.il/PTelements.asp?s=Density List of Periodic Table Elements Sorted by Density]
* {{en sprog}} [http://www.moerchscan.dk/tekspec.htm Lava Pimpsten] {{dødt link}}
* {{en sprog}} [http://www.cet.sunderland.ac.uk/webedit/allweb/news/Philosophy_of_Science/PIRT2002/londres2002-2.doc COLLAPSING STARS (doc)] Atomkernemassefylde. {{dødt link}}
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