From our database we have the following answer:
Iron, a solid at room temperature, becomes a liquid at 2800 degrees Fahrenheit (really, REALLY hot) and a gas at 5182 degrees Fahrenheit (about half the temperature of the sun).

When things are hot, the molecules and atoms move around more and faster, and when they are cold they are slower. The temperature you need to make the molecules move fast enough to be a gas or slow enough to be a solid depends on the type of interactions between the molecules.