Yes, at higher pressure and/or low temperature chlorine is a liquid.
cool it down past it's boiling point (about -34 degrees celsius)
Chlorine can just be liquefied by passing the gas through a freezing mixture as its boiling point is -34 degrees C. Alternately it can be passed through liquid nitrogen at -196 degress C to easily liquefy. However, in practice Chlorine is usually pressurised as well as dooled in order that it can be liquefied with ease.
Milk is a liquid
LIQUIFIED NATURAL GAS
Liquified Petroleum
putting it in liquified gas.
A family of inert, nontoxic, and easily liquified chemicals used in refrigeration, air conditioning, packaging, insulation, or as solvents and aerosol propellants. Because CFCs are not destroyed in the lower atmosphere they drift into the upper atmosphere where their chlorine components destroy ozone.
Liquified nickel and iron.
Yes, Liquified Petroleum Gas is a Gas. It is a mixture of butane and propane. Also ethyl mercaptan is added to LPG to detect the gas leakage.
carbon dioxide
Oxygen is not flammable but is necessary for combustion.
Melted/Liquified