Milk is a liquid
LIQUIFIED NATURAL GAS
Liquified Petroleum
putting it in liquified gas.
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.
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.
Melted/Liquified
LPG is Liquified Petroeum Gas
The word for making into a liquid is to "liquefy" (the preferred US spelling). It can, however, also be spelt "liquify" in the UK.
Yes, at higher pressure and/or low temperature chlorine is a liquid.