why is water a liquid?

Water is a liquid ( at room temperature ) because of hydrogen bonding.

remember - gas - the particles (molecules or atoms) that make it up are
moving very fast, are far apart from each other and thus the forces of
attraction between them are very weak.
- liquid - the particles (molecules or atoms)that make up a
liquid moving slower, are much closer than a gas sample's and the
attractive forces have the chance to hold them close.

Water as a liquid has particles that are close. and water has a special
kind of attractive force the hydrogen bonds, these form between water
mollecules. the hydrogens from one water are atracted to the oxygen on
another water molecule. This force is fairly strong making water a liquid
at lower temperatures than similar molecules. Specifically the hydrogens
are atracted to the two pairs of unshared electrons on the Oxygen atoms in
the other water.

Water is not flammable. A mixture of Hydrogen gas and Oxygen gas would be
flammable. When the Hydrogen burns it reacts with the Oxygen forming H2O (
water )the hydrogen and the oxygen want to form a bond and when they burn
that bond is formed. Water is the result of Hydrogen and Oxygen reacting.
So when you have water the bond is already formed.