water is a liquid. Generally Liquids and Fluids are classified. Liquids are that state of matter which have loosely arranged molecules and they are highly flowy. Fluids are that state of matter which are a little more thick than liquids that is more viscous. for example, water is a liquid and Honey a fluid.
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no difference
Any pressure difference is irrelevant. The distinction is in the operating fluid. In pneumatic systems, it's a gas. In hydraulic systems, it's a liquid.
Water expands when turning to ice (which is why water pipes can burst in winter). So the difference is in volume (size).
There is not a constant difference. At the freezing point of water, 0 deg Celsius = 32 deg Fahrenheit - a difference of 32. At the boiling point of water = 100 deg C = 212 deg F, the difference is 180.
Those are two completely different operations.