That is a very good question. And the answer
is yes. A gas can be more dense than a
liquid. But the conditions for this to be met are
pretty difficult to come by. The density of a gas
is dependent upon the pressure and the temperature
that it is under.
The density of a gas is directly proportional
to the pressure and indirectly proportional to the
temperature. This means that if the pressure
the density will increase and if the temperature
decreases the density will increase.
The density of a liquid on the other hand is
always constant. Which is measure by the mass of
the liquid divided by the volume. So if you can
imagine a place that is really cold and under a
lot of pressure, for instance, in space in a black
hole or at the bottom of the ocean, you could make
a gas more dense than liquid. I hope this helps
and keep asking those questions!
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