Some observers have suggested that as cognitive psychology became a movement during the 1970s, the intricacies of the phenomena and processes it examined meant it also began to lose cohesion as a field of study.
Iron has a melting point of 1535.0 degrees Celsius or 2795.0 degrees Fahrenheit. It has a boiling point of 2750.0 degrees Celsius or 4982.0 degrees Fahrenheit. Continue Reading.
For Hydrogen, the boiling point is -253 degrees Celsius; for Mercury it is 357 degrees Celsius, and for Iron it is 2,750 degrees Celsius. From these numbers you can see that at room temperature (and indeed for nearly any temperature found on Earth) Hydrogen is a gas, Mercury is a liquid, and Iron is a solid.