LH:
"Hmmm. Okay...water is a liquid. That means that it flows. It follows the path of least resistance and adjusts itself to match the inner shape of any container that it fills.

Now...tell me what I have left out. :-) "
You had to ask!

Water is generally a liquid at temperatures betwee 0 degrees centigrade and 100 degrees centigrade. The exceptions occur when the ambient pressure is not standard. In a "pressure cooker" water boils at a higher temperature, thus cooking your food quicker. Near the top of Everest, where the atmospheric pressure is much lower, boiling water will hardly be hot enough to make a cup of tea.

water is a liquid. That means that it flows Water is a fluid (as are gasses).
flu·id   
n.
A continuous, amorphous substance whose molecules move freely past one another and that has the tendency to assume the shape of its container; a liquid or gas. (American Heritage Dictionary)

Cheers

Nigel (leaving himself wide-open for further correction)