no it's a gas,

compressed to around 1% of normal volume.

If it was compressed to the liquid state, you'd call it liquified natural gas (LNG).

When a gas is compressed, so volume is decreased, the pressure increases. P=1/V

Compressed natural gas is natural gas under pressure which remains clear, odorless, and non-corrosive. This is when natural gas is compressed to less than 1% of its volume at standard atmospheric pressure.

138,700 btu's

ues it can be compressed