Usually by compression and then cooling the resulting concentrate.
The three main groups of compressed gases are Dissolved, Liquified and Non-Liquified gases. You can learn more about gases and compressed gases at the Wikipedia website.
It depends on the gas. Different gases have different densities when liquified.
Noble gsase are liquefied at very low temperatures, with many difficulties and expenses.
You could not jump at all on Neptune as it is made up primarily of gases and liquified gases. It has no solid surface from which one could jump.
Gases can be liquified by increasing pressure and decreasing temperature through a process known as compression refrigeration. When the pressure on a gas is increased and its temperature is lowered, the gas molecules come closer together, causing them to condense into a liquid state.
DOT Division 2.2 is for nonflammable compressed gases.
easily liquifiable gases like Cl2, NH3,SO2,HCl are readily adsorbed because the critical temp of these gases are more. so it is easily liquified and adsorbed more readily.[critical temp is the minimum temp above which a gas cannot be liquified]easily liq. gases possess greater vanderwaals forces ,so they are adsorbed readily.these are the 2 reasons why these gases are readily adsorbed than permanent gases like H2, O2.N2 . etc
Liquid air appears colorless and transparent, much like water when it is in its liquid state. It can sometimes form a misty appearance due to the rapid evaporation of nitrogen and oxygen gases from its surface.
I think the only liquids that do not contain water, besides the liquified form of various metals and nonmetals or gases or compounds such as Hydrogen Peroxide, are the elements Bromine (BR) and Mercury (HG).
Milk is a liquid
LIQUIFIED NATURAL GAS
Liquified Petroleum