Most substances found in nature exhibit a behavior where they change from solid to liquid and from liquid to gas as the temperature is raised. On decreasing the temperature the change in state is reversed.
In addition to temperature, pressure also plays a large role in what state a substance exists at. At atmospheric pressure it is possible to cool down all elements so that they are at solid state. For the element helium, in addition to an extremely low temperature (below 1.5 K) it is also required to increase pressure to above 2.5 MPa so that it changes state to solid.
It is not possible to convert all elements to the solid state merely by lowering temperature; for some elements it is important to apply an appropriately high pressure.
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