Referát - voda

22. prosince 2006 v 14:39 | **Kachii**
VODA
Voda je chemická sloučenina vodíku a kyslíku.
Je základní podmínkou pro existenci života na Zemi. Za normální teploty a tlaku je to bezbarvá, čirá kapalina bez zápachu, v silnější vrstvě namodralá. V přírodě se vyskytuje ve třech skupenstvích: v pevném - led, v kapalném - voda a v plynném - vodní pára.
Voda je základní podmínkou života. Vznikl v ní život. Je to rozpouštědlo, ve kterém probíhají veškeré chemické děje v organismu. Lidské tělo obsahuje 70% vody a rostliny až 90 % vody. Už ztráta 20 % tělesné vody je smrtelná. Na dehydrataci člověk umírá asi během 7 dnů.
Je nejdůležitější surovinou všech průmyslových odvětví, používá se ke chlazení, ohřevu, oplachu, k výrobě elektrické energie ve formě páry a v potravinářství k výrobě nápojů atd.
Většinu povrchu Země (71 %) tvoří slaná voda, ta tvoří 97 % celého vodstva na naší planetě. Obsahuje průměrně 35g solí v jednom litru.
Sladká voda tvoří jen nepatrnou část hydrosféry - 3 %, přičemž 69 % této vody je v ledovcích, které jsou v polárních oblastech. Dalších 30 % je voda podzemní a jen necelé procento tvoří voda povrchová a atmosférická.
- Na jednoho člověka připadá okolo 300 milionů tun vody.
Veškerý prostor, který na Zemi zaujímá voda, se nazývá hydrosféra.
Hydrosféra = oceány, moře, voda tekoucí na povrchu Země - tekoucí i stojatá + podzemní voda
Koloběh vody-(hydrologický cyklus) je stálý oběh povrchové a podzemní vody na Zemi, doprovázený změnami skupenství.
- voda se vypařuje z oceánů a z vodních ploch, potom dopadá v podobě srážek nebo sněhu na zem. Voda se hromadí, nebo se vsakuje do půdy -> potok, vodní tok…
- zpravidla víc než 50 % (někdy i 100 %) se znovu vypaří
Pitná voda je vhodná ke každodennímu použití, je zbavená nečistot, obsahuje vyvážené množství minerálních látek tak, aby neškodily zdraví.
Znečištění vod - zemědělství (hnojiva), povodně (voda splachuje nečistoty z půd)
Měkká voda je voda, která obsahuje velice málo rozpuštěných látek. Je to voda dešťová a voda v potocích řekách.
Voda, která prochází vrstvami zemské kúry se nazývá voda tvrdá a obsahuje hodně rozpuštěných minerálních látek.
Minerální voda - Některé minerální vody mají léčivé účinky a kolem jejich naleziště často bývají postaveny lázně a léčebná zařízení.
 

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