why does metal rust in cold water while it doesn't in a warm one?

Question

please help me in my projct...huhuhuh

Answer 1

Rusting is the process of oxygen joining onto metal (called oxidization). In cold water, there is a small amount of oxygen dissolved in it that can make this process happen. As you increase the heat, less oxygen can dissolve in the water, so the metal does not oxidize as easily.

This happens because gases are less soluble in hot liquid than in cold liquid.

Experiment: Root beer fountain.

Take a metal nail at room temperature and drop it into a small bottle of root beer. Nothing happens.
Take a nail heated over a fire (Careful! Use tongs!) and drop it into the root beer. The root beer gushes up as the carbon dioxide escapes because it cannot remain dissolved in the hot temperature.

Answer 2

I am not sure of the premise of this question. My experience is that rust is a much more serious problem in tropical seawater than colder water. I am thinking here particularly of the splash zone. It is true that the solubility of oxygen in warm water is less than that in cold water but on the other hand the reaction proceeds more quickly at higher temperatures.

Answer 3

Because the molecules are closer together in cold water than they are in warm or hot water

Answer 4

There is not any dissolved oxygen in hot water , but it exists in cold water

Answer 5

ask a scientist of go to the following sites;
www.google.com
www.britannica.com
www.encarta.com
www.answers.com [it is the best site]