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'''Banyu''' ([[Bahasa Jawa|Jawa]]: banyu, [[Bahasa Indonesia|Indonesia]]: air, [[Bahasa Brunei|Brunei]]/[[Bahasa Bukit|Bukit]]/Banjar archaisbahari: aing) adalah zat atawa materi atawa unsur nang panting gasan samunyaan bantuk kahidupan nang dikatahui sampay wahini di atas bumi. Istilah banyu diinjam matan bahasa Jawa Hanyar gasan mangganti istilah aing, nang sabujurnya masih dipakay dalam Hikayat Banjar (abad XVII). <ref>{{En}} Philip Ball, ''Water and life: Seeking the solution'', [http://www.nature.com/nature/journal/v436/n7054/full/4361084a.html Nature '''436''', 1084-1085 (25 August 2005) | doi:10.1038/4361084a]</ref><ref>{{En}} [http://www.umanitoba.ca/institutes/fisheries/waternot.html Water - The Essential Substance], Experimental Lakes Area, University of Manitoba</ref><ref>[http://www.calacademy.org/exhibits/xtremelife/ingredients.php What are the Essential Ingredients of Life?], Natural History Museum, California Academy of Sciences</ref> tapi pang kada di planet nang lain.<ref>{{En}} Steven A Benner, ''Water is not an essential ingredient for Life, scientists now claim'', [http://www.spaceref.com/news/viewpr.html?pid=15568 SpaceRef.com], [http://uplink.space.com/showflat.php?Cat=&Board=seti&Number=99260&page=21&view=collapsed&sb=5&o=0&fpart= uplink.space.com]</ref> Banyu manutupi parak 71% parmukaan bumi. Ada 1,4 triliun [[kilometer|kilometer]] kubik (330 juta mil³) tasadia di bumi.<ref>{{En}} http://www.unep.org/vitalwater/01.htm</ref> Banyu sabahagian basar tahaga di [[laut|laut]] ([[ banyu masin| banyu masin]]) wan di lapisan-lapisan es (di kutub wan puncak-puncak gunung), tapi jua kawa batampay sabagai [[awan|awan]], [[hujan|hujan]], [[sungay|sungay]], [[muka banyu hambar|muka banyu hambar]], [[danaw|danaw]], [[uap banyu|uap banyu]], wan [[lautan es|lautan es]]. Banyu dalam obyek-obyek tutih bagarak ma’umpati suatu [[siklus banyu|siklus banyu]], yaitu: malalui [[panguapan|panguapan]], [[hujan|hujan]], wan aliran banyu di atas parmukaan tanah (''runoff'', tamasuk guntung/[[mata air|mata air]], [[sungay|sungay]], [[muhara|muhara]]) manuju ka [[laut|laut]]. Banyu barasih panting sagan kahidupan [[manusia|manusia]]. Banyak jua tampat di dunia ma’alami kakurangan parsadiaan banyu. Kada di bumi haja, sajumlah basar banyu ada jua diparkiraakan tahaga di [[kutub|kutub]] utara wan salatan planet [[Mars|Mars]], sarta di bulan-bulan [[Europa|Europa]] wan [[Enceladus|Enceladus]]. Banyu kawa jua dalam ujud [[padat|padat]]an (es), [[cair|cair]]an (banyu) wan [[gas|gas]] (uap banyu). Banyu sabujurannya sabubutingannya zat nang sacara alami tahaga di parmukaan bumi dalam katiga buting ujudnya nang itu.<ref>{{En}} Peter Tyson, ''Life's Little Essential'', [http://www.pbs.org/wgbh/nova/origins/essential.html NOVA, Origins, July 2004]</ref> Pangalolaan sumber daya banyu nang kurang baik bisa manyababakan kakurangan banyu, monopolisasi awan jua privatisasi wan bahkan banyu bisa jua manyababakan tahual/ konflik. <ref>{{En}} H.E. Msgr. Renato R. Martino, ''Water, an Essential Element of Life'', [http://www.vatican.va/roman_curia/pontifical_councils/justpeace/documents/rc_pc_justpeace_doc_20030322_kyoto-water_en.html A Contribution of the Delegation of the Holy See on the Occasion of the third World Water Forum, Kyoto, Japan, 16th-23rd March 2003]</ref>
Indonesia sudah ba’isi undang-undang nang maatur sumber daya banyu tumat tahun 2004, yakni Undang Undang nomor 7 tahun 2004 tentang Sumber Daya Air
== Sifat-sifat kimia wan fisika ==
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