Cornflower... and corn flour, for that matter... is neither a liquid nor a gas and cannot be induced to become either; it decomposes first.
It is a non newtonian liquid - simple!
A heated liquid become a gas at the boiling point.
I think oil is a gas because it can become a gas.
The process of a liquid becoming a gas is "evaporation". The liquid 'evaporates' to become a gas.
A heated liquid will become a gas.
Water changes from liquid to solid at 0 degrees Celsius.
When you put gas in a super freezing place, it becomes liquid.
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Hydrogen is a gas. The only method that can cause this gas to become liquid is pressure.
A gas become a liquid after cooling to the adequate temperature - the condensation point.
This gas become a liquid.