水(化学式为H2O),是由氢、氧两种元素组成的无机物,无毒,可饮用。在常温常压下为无色无味的透明液体,被称为人类生命的源泉,是维持生命的重要物质,也叫氧化氢。
水是地球上最常见的物质之一,地球表面约有71%被水覆盖。它是包括无机化合、人类在内所有生命生存的重要资源,也是生物体最重要的组成部分。它在空气中含量较少,但却是空气的重要组成部分。![](https://gsp0.baidu.com/5aAHeD3nKhI2p27j8IqW0jdnxx1xbK/tb/editor/images/client/image_emoticon1.png)
![](https://gsp0.baidu.com/5aAHeD3nKhI2p27j8IqW0jdnxx1xbK/tb/editor/images/client/image_emoticon1.png)
![](https://gsp0.baidu.com/5aAHeD3nKhI2p27j8IqW0jdnxx1xbK/tb/editor/images/client/image_emoticon1.png)
![](http://tiebapic.baidu.com/forum/w%3D580/sign=d65c11a268dda3cc0be4b82831e93905/dab4f8f0f736afc3e45bb758f519ebc4b64512b0.jpg?tbpicau=2024-07-03-05_9fe33d776c436c1ff6ac3041454f51c8)
![](http://tiebapic.baidu.com/forum/w%3D580/sign=b1b71ec13ad98d1076d40c39113fb807/2ecd2fc379310a552c7356c9f14543a9832610b0.jpg?tbpicau=2024-07-03-05_ee7ff042155195f89f22855644a544dd)
水是地球上最常见的物质之一,地球表面约有71%被水覆盖。它是包括无机化合、人类在内所有生命生存的重要资源,也是生物体最重要的组成部分。它在空气中含量较少,但却是空气的重要组成部分。
![](https://gsp0.baidu.com/5aAHeD3nKhI2p27j8IqW0jdnxx1xbK/tb/editor/images/client/image_emoticon1.png)
![](https://gsp0.baidu.com/5aAHeD3nKhI2p27j8IqW0jdnxx1xbK/tb/editor/images/client/image_emoticon1.png)
![](https://gsp0.baidu.com/5aAHeD3nKhI2p27j8IqW0jdnxx1xbK/tb/editor/images/client/image_emoticon1.png)
![](http://tiebapic.baidu.com/forum/w%3D580/sign=d65c11a268dda3cc0be4b82831e93905/dab4f8f0f736afc3e45bb758f519ebc4b64512b0.jpg?tbpicau=2024-07-03-05_9fe33d776c436c1ff6ac3041454f51c8)
![](http://tiebapic.baidu.com/forum/w%3D580/sign=b1b71ec13ad98d1076d40c39113fb807/2ecd2fc379310a552c7356c9f14543a9832610b0.jpg?tbpicau=2024-07-03-05_ee7ff042155195f89f22855644a544dd)