Maximum density - Wikipedia Maximum density The maximum density of a substance is the highest attainable density of the substance under given conditions. Contents 1 Attaining maximum density 2 Water 3 References 4 See also Attaining maximum density Almost all known substances undergo thermal expansion in response to heating, meaning that a given mass of substance contracts to a low volume at low temperatures, when little thermal energy is present. Substances, especially fluids in which intermolecular forces are weak, also undergo compression upon the application of pressure. Nearly all substances therefore reach a density maximum at very low temperatures and very high pressures, characteristic properties of the solid state of matter. Water Further information : Water ( molecule ) § Density of water and ice An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 ° C ( 39.16 ° F ). This has important ramifications in Earth 's ecosystem. References Jump up ^ Ruth M. Lynden - Bell ; Simon Conway Morris ; John D. Barrow ; John L. Finney ; Charles Harper ( 21 May 2010 ). Water and Life : The Unique Properties of H2O. CRC Press. pp. 78 --. ISBN 978 - 1 - 4398 - 0357 - 8. See also List of elements by density Density Specific Gravity Specific weight Charge density Buoyancy Hydrometer This physical chemistry - related article is a stub. You can help Wikipedia by expanding it. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Maximum_density&oldid=756593284 '' Categories : Density Condensed matter physics Physical chemistry Physical quantities Physical chemistry stubs Talk Contents About Wikipedia Add links This page was last edited on 25 December 2016, at 10 : 50 ( UTC ). About Wikipedia

Question: density of water is maximum at which temperature
Answer: 3.98 °C (39.16 °F)