Hydrogen Bonding – Water is a liquid at room temperature due to the presence of hydrogen bonds between water molecules. The state of a molecule is determined by intermolecular forces, such as dipole-dipole interactions, Van der Waals forces (also called London dispersion forces), and hydrogen bonds.
Water (H2O) is unique in that it has extremely strong hydrogen bonds, but a very low molecular weight (18 grams per mole) . Usually molecules with very low molecular weights are gases at room temperature. Consider for example carbon dioxide (CO2) with a molar mass of 44 g/mole, which is a gas. Other molecules with low molecular weights are nitrogen gas (N2, 28 g/mole), oxygen gas (O2, 32 g/mole), propane (C3H8, 44 g/mole) and butane (C4H10, 58 g/mole). All of these are gases and yet have much higher molecular weights than water does. However, none of these can hydrogen bond, and that is why they are gases, whereas water is a liquid.
Of course, at high temperatures water is a gas (steam) and at low temperatures water is a solid (ice). Via Why water is liquid at room temperature.
We guess that the pressure has an input as well – Deskarati