Air can be compressed but water cant why?

2) If you mix 2 substances how do you if a chemical reaction formed?

Answer:
Because water is more dense because it is a liquid, not a gas.

2) Change in color, a smell, fizzing or release of gas. It is often very hard for scientist to find out if a reaction has occured.
Water CAN be compressed - just not very much
Water is a substance and air is a gas
1. Water can be compressed. Air is more obvious because your taking molecules that are very far apart from each other and pushing them together, yet they are still moving at a high velocity creating a lot of pressure. If you want an example of water "compression" look at pipes.

2. Generally when you have a chemical reaction (not all chemical reactions respond this way). You receive a product and heat. Again I want to stress that not all chemical reactions produce a noticable amount of heat. The most common reaction that is an example is mixing an acid and a base to produce a salt, water, and heat.
Liquids are very strange substances, they handle like gases, but also act like solids. Gases can be compressed since there is a lot of space between them, were as liquids there isn't much space for compression, but still can be compress, and a good thing that they don't compress since that is how hydraulics work. To the other question if a precipitate forms or gas forms or a color change occurs, or heat given off, then a chemical change has occured. But, if you are able to separate them again than it isn't a chemical reaction, for instance dissolving sugar into water, you can evaporate the water and the sugar is still there, and it has changed into something else.
The atoms in air are more spread apart than the atoms in water (which is denser). You can only smush the atoms up a little bit in water. Of course ice would be least likely to be compressed.

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