For most materials and substances, and not allowing other parameters to change (like temperature), the density goes up as pressure increases.
One way to look at is like this:
Suppose a balloon is filled with air -- and sealed. Dunk it under water, which squeezes it harder, thus decreasing the volume.
The total mass is the same.
Density = mass / volume.
Since volume has gone down, density has gone up.
Another way.
Put more air in the balloon, but instead of a balloon, it has a rigid inflexible wall. Now the volume has not changed, but the mass is higher (since you increased the amount of air).
So the density is higher (see above).
But what happened to the rigid walls of the balloon. The air pushes harder on them!
So increased density causes higher pressure, and higher pressure causes increased density.
By increasing the density of a gas its air pressure will subsequently increase.
Dangerous for human
Depends on the other conditions. If the volume remains constant, the density will remain the same (but the pressure will increase). If the pressure remains constant, the volume will increase - and therefore the density (mass / volume) will decrease.
In a closed system the pressure increase. In other conditions the volume increase and the density decrease.
As atmospheric pressure increases in a specific area, the gas particles in that area become more compressed and closer together. This compression leads to an increase in gas particle density in proportion to the increase in pressure. Conversely, as pressure decreases, the gas particles become less compressed and spread out, resulting in a lower gas particle density.
If the pressure in a fluid is changed, its density is typically affected. In general, an increase in pressure leads to an increase in density, while a decrease in pressure results in a decrease in density.
Pressure affects the density of air by increase of pressure increases the density
By increasing the density of a gas its air pressure will subsequently increase.
By increasing the density of a gas its air pressure will subsequently increase.
An increase in pressure typically increases the density of a material. This is because the higher pressure causes the atoms or molecules in the material to be closer together, thus increasing the overall density.
the density will increase because there will be less space
The volume decrease and the density increase.
An increase in air density will mean a decrease in the absorption and radiation of energy. An increase of air density causes temperature and pressure to rise.
Dangerous for human
Depends on the other conditions. If the volume remains constant, the density will remain the same (but the pressure will increase). If the pressure remains constant, the volume will increase - and therefore the density (mass / volume) will decrease.
Altitude decreases, pressure increase, temperature decreases (some, but less effect than pressure), density goes up.
Temperature, pressure, and density increase as you move from the Earth's crust to the inner core.