I'm new to chemistry but find it very interesting. Today I would like to know how to make say hydrogen into its liquid form. I know it needs to get very cold and someone told me it needs to be under high pressure. I don't exactly know much about pressure and how I would go about doing this. Any response is appreciated.

Here a good sight:
http://www.airliquide.com/en/business/products/gases/gasdata/index.asp?GasID=36
If you want to know about any chemical look up its MSDS.

The gas is cooled and compressed a whole lot. As I recall from my 9th grade chemistry text, the end pressure is something like 45 atmospheres. I don't know what that translates to in bars or PSI. The compressed gas then goes through an aperture, in a process that is called . abiatic expansion The sudden drop of pressure causes the gas to lose a lot more heat, cooling it below the condensation point, making a liquid. all liquid gases are made this way, from what I know, you just adjust the pressures accordingly. Liquid, or cryogenic, H2 is problably made from a pure or almost pure gas. Nitrogen, oxygen, and many other gases are extracted from liquid air. Some gases, like CO2, don't liquify at atmosphereic pressure.

1.013 bar is standard air pressure or about 14.6psi