Transformation of coal in a substitue of oil.
Yes, liquification of air is a physical change.
Liquification is the conversation of a solid or a gas into a liquid. Christchurch suffers so much damage from liquification is cause the type of soil and soil arrangement in the regieon.
liquification
A solid turning into a liquid.
melting or liquification
Ice to water
It can be called liquification or more simply melting.
because they have small atomic masses and He has no intrmolecular forces in it
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the process of passing from a solid to a liquid is liquification but the passage from liquid to solid ist solidification
Coal mines, coal bins, coal hods, and anywhere coal is or was.
Coal Bunker, Coal scuttle, Coal hod