At the bottom of a deep mine.
Troposphere
Some of the factors affecting the mass of the air are:- temperature, altitude (pressure), gaseous composition (including water vapour), and its velocity (the PV=k). The densest air is probably that descending over the South Pole in winter, because of its low temperature, lack of water vapour, and at the surface, the air pressure at that altitude.
All matter is densest and heaviest at precisely absolute zero, which is -273.15 degrees Celsius.
an ocean would have those traits
The atmosphere is densest at sea level, so as the density of air goes down, so does the atmospheric pressure. The atmosphere gets less and less dense as you rise higher above the sea level.
Because it contains the gasses for no life. Lots of harmful gasses.that will KILL you.
Air Pressure
Which planet is the densest in our Solar system? The densest gas will drop to the bottom of the glass. Is the Amazon jungle the densest in the world?
It is different in that the seas don't have air pressure. No air; no air pressure.
The densest elements are osmium and irdium.
Air pressure affects air movement because air moves from high pressure to low pressure. The air pressure pushes or will press the air around.
Earth is the densest planet.