nothing dencity never changes
what happens to interstellear gas as it passes through a spiral density wave
As you rise up through the atmosphere, there is less of the atmosphere above you to press down on you. Thus less pressure.
the warm air raises
It becomes heavier. The movement of solvent through a membrane produces a pressure called the osmotic pressure. This happens when the pressure in which the solvent is flowing is raised to the equivalent of the pressure moving through the membrane from the hypotonic side.
presure = density*V2/2. Where V is your velocity and you density is the density of the moving fluid or the fluid the object in question is moving through. Often pressure is calculated in head which is V2/2g. Where g is gravity(9.81ms-2)
what happens to interstellear gas as it passes through a spiral density wave
As you rise up through the atmosphere, there is less of the atmosphere above you to press down on you. Thus less pressure.
Dcreases
There will be a pressure drop in both. But there will be more of a pressure drop in a grease tube due to the density of the fluid. If you look at the darcy-weisbach equation density is on the top, therefore the more dense the fluid is the more change in pressure there will be.
Density gets higher.
the warm air raises
The gas molecules are constantly in motion, colliding with each other and the walls of the ball. The pressure inside the ball is also much greater than the pressure outside the ball. When there's a hole in the ball, the molecules keep colliding, and some make there way out through the hole. Remember that the molecules want to go to the area of lowest pressure so that they can be at equilibrium.
They burn up and explode.
As light moves through the atmosphere, it continues to go straight until it bumps into a bit of dust or gas molecules
It becomes heavier. The movement of solvent through a membrane produces a pressure called the osmotic pressure. This happens when the pressure in which the solvent is flowing is raised to the equivalent of the pressure moving through the membrane from the hypotonic side.
pressure decreases
Temperature and Pressure! As temperature increases, density will tend to decrease. Conversely, as pressure increases, density will increase. I say "tend to" because water will actually expand as temperature reduces through its freezing point! Cheers, Robin